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Find the number of ways of selecting 9 b...

Find the number of ways of selecting 9 balls from 6 red balls, 5 white balls and 5 blue balls if each selection consists of 3 balls fo each colour.

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`=20xx10xx10=2000`
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FULL MARKS-COMBINATORICS AND MATHEMATICAL INDUCTION-ADDITIONAL QUESTIONS
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  6. If ""^(nP(r)=""^(n)P(r+1) and ""^(n)C(r)=""^(n)C(r-1) find n and r.

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  7. A committee of 7 peoples has to be formed from 9 men and 4 women . In ...

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  8. In .^(2n)C(3) :.^(n)C(3) = 11 : 1 then n is

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  9. Find the number of ways of selecting 9 balls from 6 red balls, 5 white...

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  10. If 1/(7!)+1/(9!)=x/(10!), find x.

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  18. Prove that For any natural number n, 7^n - 2^n is divisible by 5.

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