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Maths
7. Permutations and Combinations
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Q26 of 64 Page 122

If nC12 = nC8, then n is equal to

Given:-nC12 = nC8


Formula: - (i) nCr


n-8=12


n=20

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24

A sports team of 11 students is to be constituted, choosing at least 5 from Class XI and atleast 5 from Class X II. If there are 20 students in each of these classes, in how many ways can the team be constituted?

25

A group consists of 4 girls and 7 boys. In how many ways can a team of 5 members be selected if the team has

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(iii) at least three girls.

27

The number of possible outcomes when a coin is tossed 6 times is

28

The number of different four digit numbers that can be formed with the digits 2, 3, 4, 7 and using each digit only once is

Questions · 64
7. Permutations and Combinations
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64
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