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Answered on 19/11/2016 Learn Permutation and Combinations +2 Mathematics

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Solve: 5! ?

Sadiya Ghori

Accountancy Tutor

120
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Answered on 28/11/2016 Learn Permutation and Combinations +2 Mathematics

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

Tapas Bhattacharya

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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 Mathematics

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How many 3-digit numbers can be formed from the digits 2, 3, 5, 6, 7, 9 which are divisible by 5 and...
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?

Tapas Bhattacharya

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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 Mathematics

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

Sreedevi Addepalli

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(100)! / 98!
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Answered on 01/12/2016 Learn Permutation and Combinations +2 Mathematics

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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 Mathematics

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What is the difference between permutation and combination?

Sreedevi Addepalli

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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 Mathematics

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Solve: (9) P (3)?

Sarvajeet Kumar

An Experienced Trainer

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Asked on 05/11/2016 Learn Permutation and Combinations +2 Mathematics

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In a group of 6 boys and 4 girls, four children are to be selected. In how many different ways can they...
In a group of 6 boys and 4 girls, four children are to be selected. In how many different ways can they be selected such that at least one boy should be there?

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Asked on 05/11/2016 Learn Permutation and Combinations +2 Mathematics

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In how many different ways can the letters of the word ‘MATHEMATICS’ be arranged such that the vowels...
In how many different ways can the letters of the word ‘MATHEMATICS’ be arranged such that the vowels must always come together?

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Asked on 05/11/2016 Learn Permutation and Combinations +2 Mathematics

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There are 8 men and 10 women and you be need to form a committee of 5 men and 6 women. In how many ways...
There are 8 men and 10 women and you be need to form a committee of 5 men and 6 women. In how many ways can the committee be formed?

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