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۱۰ اردیبهشت ۱۳۹۸
آخرین بروزرسانی
بیشتر از ۳ سال قبل

# Probability

### Installation:

``````npm install probabilityjs --save
``````

#### Methods:

• `singleChoose`

when you are computing probability of selecting set A from set S here you have one type of selection, such as selecting odd numbers in rolling dice.

Examples: calculate probability of even numbers in rolling dice

``````let A = [2, 4, 6]
let S = [1, 2, 3, 4, 5, 6]
let p = probablity.singleChoose(A, S)
console.log(p)
// 0.5
``````

your are rolling dice, 3 times, calculate probability of that result is smaller than 5

``````let A = [1, 2, 3, 4]
let S = [1, 2, 3, 4, 5, 6]
p  =  probablity.singleChoose(A, S, {
select:  3 //number of rolling dice
})

console.log(p)
//0.2
``````

calculate probability of 1 and 6 in rolling dice

``````let A = [1, 6]
let S = [1, 2, 3, 4, 5, 6]
p  =  probablity.singleChoose(A, S, {
decimals: 8
})

console.log(p)
//0.33333333
``````

#### Methods:

• `multiChoose`

choosing a items among different type of it, such as choosing 4 red cards from 12 red card and 20 black card

Examples: calculate probability of choosing 1 red card from 26 red and 26 black card

``````let  A  = [
{
name:  'red',
count:  1
}
]

let  S  = [
{
name:  'red',
count:  26
},
{
name:  'black',
count:  26
}
]
let  p  =  probablity.multiChoose(A, S)
console.log(p)
//0.5
``````

Choosing 2 red cards at the same time from 26 red and 26 black card

``````let  A  = [
{
name:  'red',
count:  1
}
]

let  S  = [
{
name:  'red',
count:  26
},
{
name:  'black',
count:  26
}
]
let  p  =  probablity.multiChoose(A, S)
console.log(p)
//0.24509803921568626
``````

choosing 1 red card and then choose 1 red card again from 26 red and 26 black card

``````let  A  = [
{
name:  'red',
count:  1
},
{
name:  'red',
count:  1
}
]

let  S  = [
{
name:  'red',
count:  26
},
{
name:  'black',
count:  26
}
]
let  p  =  probablity.multiChoose(A, S)
console.log(p)
//0.2549019607843137
``````

choosing 2 black card and then 1 red card from 26 red and 26 black card

``````let  A  = [
{
name:  'black',
count:  2
},
{
name:  'red',
count:  1
}
]

let  S  = [
{
name:  'red',
count:  26
},
{
name:  'black',
count:  26
}
]
let  p  =  probablity.multiChoose(A, S)
console.log(p)
//0.12745098039215685
``````

choosing 1 blue card from 100 blue card, 5 red card and 6 yellow card

``````let  A  = [
{
name:  'blue',
count:  1
}
]

let  S  = [
{
name:  'blue',
count:  100
},
{
name:  'red',
count:  5
},
{
name:  'yellow',
count:  6
}
]
let  p  =  probablity.multiChoose(A, S)
console.log(p)
//0.9009009009009009
``````

any question ? Ask It :)