Thursday 30 August 2012

Wednesday 29 August 2012

Prime Numbers

What is prime number?

Prime number is a positive natural number that has only two positive natural number divisors: 1 and itself.
The number 1 is not a prime number by definition - it has only one divisor.
The number 0 is not a prime number - it is not a positive number and has infinite number of divisors.
The number 15 has divisors of 1,3,5,15 because:
15/1=15
15/3=5
15/5=3
15/15=1
So 15 is not a prime number.
The number 13 has only two divisors of 1,13.
13/1=13
13/13=1
So 13 is a prime number.

Prime numbers list

List of prime numbers up to 100:
2,3,5,7,11,13,17,19,23,29,31,37,41,43,47,53,59,61,67,71,73,79,83,89,97,...

Is 0 a prime number?

The number 0 is not a prime number.
Zero is not a positive number and has infinite number of divisors.

Is 1 a prime number?

The number 1 is not a prime number by definition.
One is has one divisor - itself.

Is 2 a prime number?

The number 2 is a prime number.
Two has 2 natural number divisors - 1 and 2:
2 / 1 = 2
2 / 2 = 1

Kelas Tuisyen


ASTAN  JAYA TUITION
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(Pn.Riska : 0125900006) riskachon@yahoo.com.my   www.astanjaya.blogspot.com
  
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Monday 20 August 2012

English Idioms & Idiomatic Expressions (Beginning with D)

Daft as a brush
(UK) Someone who is daft as a brush is rather stupid.
Damp squib
(UK) If something is expected to have a great effect or impact but doesn't, it is a damp squib.
Dancing on someone's grave
If you will dance on someone's grave, you will outlive or outlast them and will celebrate their demise.
Dark horse
If someone is a dark horse, they are a bit of a mystery and we don't know how they will react or perform.
Davey Jones' locker
Davey Jones' locker is the bottom of the sea or resting place of drowned sailors.('Davy Jones' locker' is an alternative spelling.)
Day in the sun
If you have your day in the sun, you get attention and are appreciated.
Daylight robbery
If you are overcharged or underpaid, it is a daylight robbery; open, unfair and hard to prevent. Rip-off has a similar meaning.
Days are numbered
When someone’s days are numbered, they are expected to die soon.
Dead air
When there is a period of total silence, there is dead air.
Dead and buried
If something is dead and buried, it has all long been settled and is not going to be reconsidered.
Dead as a dodo
If something's dead as a dodo, it is lifeless and dull. The dodo was a bird that lived the island of Mauritius. It couldn't fly and was hunted to extinction.
Dead as a doornail
This is used to indicate that something is lifeless.
Dead duck
Someone or something is bound to fail or die is a dead duck.
Dead even
If people competing are dead even, they are at exactly the same stage or moving at exactly the same speed.
Dead from the neck up
Someone who's dead from the neck up is very stupid indeed.
Dead heat
If a race ends in a dead heat, two or more finish with exactly the same result.
Dead in the water
If something is dead in the water, it isn't going anywhere or making any progress.
Dead level best
If you try your dead level best,  you try as hard as you possibly could to do something.
Dead man walking
A dead man walking is someone who is in great trouble and will certainly get punished, lose their job or position, etc, soon.
Dead meat
This is used as a way of threatening someone: You'll be dead meat if you don't go along.
Dead men's shoes
If promotion or success requires replacing somebody, then it can only be reached by dead men's shoes' by getting rid of them.
Dead right
This means that something or someone is absolutely correct, without doubt.
Dead to the world
If somebody's fast asleep and completely unaware of what if happening around them, he or she's dead to the world.
Dead wrong
If someone is dead wrong, they are absolutely in error, absolutely incorrect or of incorrect opinion.
Deaf as a post
Someone who is as deaf as a post is unable to hear at all.
Dear John letter
A letter written by a partner explaining why they are ending the relationship is a Dear John letter.
Death of a thousand cuts
If something is suffering the death of a thousand cuts, or death by a thousand cuts, lots of small bad things are happening, none of which are fatal in themselves, but which add up to a slow and painful demise.
Death warmed up
(UK) If someone looks like death warmed up, they look very ill indeed. ('death warmed over' is the American form)
Decorate the mahogany
(USA) When someone buys a round a pub or bar, they decorate the mahogany; putting cash on the bar.
Deep pockets
If someone has deep pockets, they are wealthy.
Deep pockets but short arms
Someone who has money but never puts his hand in his pocket to pay for anything has deep pockets but short arms.
Deer in the headlights
When one is caught offguard and needs to make a decision, but cannot react quickly.
Deliver the goods
Do what is required, come up to expectations. For example, Kate delivered the goods and got us the five votes we needed. This phrase alludes to delivering an order of groceries or other items. [Colloquial; second half of 1800s]
Demon weed
Tobacco is the demon weed.
Derring-do
If a person shows derring-do, they show great courage.
Devil finds work for idle hands
When people say that the devil finds work for idle hands, they mean that if people don't have anything to do with their time, they are more likely to get involved in trouble and criminality.
Devil is in the detail
When people say that the devil in the detail, they mean that small things in plans and schemes that are often overlooked can cause serious problems later on.
Devil may care
If you live a devil-may-care life it means you are willing to take more risks than most people.
Devil's advocate
If someone plays Devil's advocate in an argument, they adopt a position they don't believe in just for the sake of the argument
Diamond in the rough
A diamond in the rough is someone or something that has great potential, but isn't not refined and polished.
Dice with death
If you do something that is very dangerous, you are dicing with death.
Die is cast
If the die is cast, a decision has been made that cannot be altered and fate will decide the consequences.
Different kettle of fish
If something is a different kettle of fish, it is very different from the other things referenced.
Different ropes for different folks
(USA) This idiom means that different people do things in different ways that suit them.
Different strokes for different folks
(USA) This idiom means that different people do things in different ways that suit them.
Dig way down deep
When someone digs way down deep, they look into their inner feelings to see how they feel about it.
Dig your heels in
If you dig your heels in, you start to resist something.
Dime a dozen
(USA) If something is a dime a dozen, it is extremely common, possibly too common.
Dine on ashes
I someone is dining on ashes he or she is excessively focusing attention on failures or regrets for past actions. 
Dinosaur
A dinosaur is a person who is thought to be too old for their position.