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Lesson Posted on 20/08/2018 Learn Permutation and Combinations

Notes on Permutation,Combination

Raj Kumar

I am Six Sigma Black belt trained from American Society of Quality I am 2011 pass out in B.tech from...

A permutation is merely meaning the arrangement of things in how many ways the elements can be arranged permutation word comes from a Latin word which means to change thoroughly or exchange the things If we care about the Order arrangement, then it is a permutation. Picking a 1st,2nd and 3rd place... read more

A permutation is merely meaning the arrangement of things in how many ways the elements can be arranged

permutation word comes from a Latin word which means to change thoroughly or exchange the things

If we care about the Order arrangement, then it is a permutation.

Picking a 1st,2nd and 3rd place in the race is an example of permutation .because the order matters

 

The combination is merely meaning the selection of group

Combination word comes from a Latin word which means joins two by two

If we do not care about the order, so it is called the combination

 

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Answered on 19/11/2016 Learn Permutation and Combinations +2 Class XI-XII Tuition (PUC) Mathematics

Solve: 5! ?

Eti Goyal

Mathematics is not about numbers, equation, computation, or algorithms it is about UNDERISTANDING.

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Answered on 28/11/2016 Learn Permutation and Combinations +2 Class XI-XII Tuition (PUC) Mathematics

How many words can be formed by using all letters of the word ‘BIHAR’?

Tapas Bhattacharya

Tutor

Here, all the letters are different and there are 5 letters. So, the number of words = 5! = 120.
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Answered on 04/12/2016 Learn Permutation and Combinations +2 Class XI-XII Tuition (PUC) Mathematics

How many 3-digit numbers can be formed from the digits 2, 3, 5, 6, 7, 9 which are divisible by 5 and... read more
How many 3-digit numbers can be formed from the digits 2, 3, 5, 6, 7, 9 which are divisible by 5 and none of the digits is repeated? read less

Tapas Bhattacharya

Tutor

For all the numbers the last digit must be 5. So, the 1st, and the 2nd places are occupied by 2, 3, 6, 7, and 9 without any repetition. So, this can be done by taking 2 digits at a time from the above 6 digits. The number of ways this can be done is 6P2 = !6/!(6-2) = !6/!4 = (6x5x4x3x2x1)/(4x3x2x1) =... read more
For all the numbers the last digit must be 5. So, the 1st, and the 2nd places are occupied by 2, 3, 6, 7, and 9 without any repetition. So, this can be done by taking 2 digits at a time from the above 6 digits. The number of ways this can be done is 6P2 = !6/!(6-2) = !6/!4 = (6x5x4x3x2x1)/(4x3x2x1) = 6x5 = 30. (Answer) read less
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Answered on 01/12/2016 Learn Permutation and Combinations +2 Class XI-XII Tuition (PUC) Mathematics

What is value of (100) P (2)?

Sreedevi Addepalli

Teacher

(100)! / 98!
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Answered on 01/12/2016 Learn Permutation and Combinations +2 Class XI-XII Tuition (PUC) Mathematics

Find out the number of ways in which 6 rings of different types can be worn in 3 fingers?

Anil Kumar

CAT Coaching Classes

Each ring has a choice of 3 fingers, so no of ways =3^6. There are no restrictions.
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Answered on 02/12/2016 Learn Permutation and Combinations +2 Class XI-XII Tuition (PUC) Mathematics

What is the difference between permutation and combination?

Sreedevi Addepalli

Teacher

Permutation involves selection and arrangement where as Combination involves only selection.
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Answered on 03/12/2016 Learn Permutation and Combinations +2 Class XI-XII Tuition (PUC) Mathematics

Solve: (9) P (3)?

Sarvajeet Kumar

An Experienced Trainer

504.
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Asked on 05/11/2016 Learn Permutation and Combinations +2 Class XI-XII Tuition (PUC) Mathematics

In how many different ways can the letters of the word ‘ LEADING’ be arranged such that the vowels should... read more
In how many different ways can the letters of the word ‘ LEADING’ be arranged such that the vowels should always come together? read less

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Asked on 05/11/2016 Learn Permutation and Combinations +2 Class XI-XII Tuition (PUC) Mathematics

A box contains 4 red, 3 white and 2 blue balls. Three balls are drawn at random. Find out the number... read more
A box contains 4 red, 3 white and 2 blue balls. Three balls are drawn at random. Find out the number of ways of selecting the balls of different colours? read less

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