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If .^(18)C(r) = .^(18)C(r+1), then evalu...

If `.^(18)C_(r) = .^(18)C_(r+1)`, then evaluate `.^(r)C_(5)`.

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56
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NAGEEN PRAKASHAN-PERMUTATION AND COMBINATION -Exercise F
  1. Find the value of n: (i) .^(n)C(10)=^(n)C(16) (ii) .^(5)C(n) =^(15)...

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  2. If .^(n)C(10) = .^(n)C(15), then evaluate .^(27)C(n).

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  3. If .^(18)C(r) = .^(18)C(r+1), then evaluate .^(r)C(5).

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  4. If .^(n)C(5) = .^(n)C(7), then find .^(n)P(3)

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  5. If .^(16)C(r) = .^(16)C(r+6), then find .^(5)C(r).

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  6. Determine n if (i) ^2n C2:^n C2=12 :1 (ii) ^2n C3:^n C3=11 :1

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  7. Determine n if (i) ^2n C2:^n C2=12 :1 (ii) ^2n C3:^n C3=11 :1

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  8. Determine n if (i) ^2n C2:^n C2=12 :1 (ii) ^2n C3:^n C3=11 :1

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  9. If .^(15)C(r): .^(15)C(r-1) = 1:5, then find r.

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  10. If .^(n-1)P3 :^(n+1)P3 = 5 : 12, find n.

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  11. If .^(n)P(r) = 720 and .^(n)C(r) = 120, then find r. = (5 xx 4 xx 3...

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  12. If ^(n+1)C(r+1): ^nCr: ^(n-1)C(r-1)=11:6:2 find the values of n and r.

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  13. If .^(n)C(4),.^(n)C(5), .^(n)C(6) are in A.P., then find the value of ...

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  14. If alpha=\ \ ^m C2,\ then find the value of \ ^(alpha)C2dot

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  15. In how many ways can a team of 11 players be selected from 14 players?

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  16. In how many ways 2 persons can be selected from 4 persons?

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  17. In how many ways can a person invites his 2 or more than 2 friends out...

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  18. In how many ways can 11 players be selected from 14 players if (i) a...

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  19. In how many ways can 5 subjects be chosen from 9 subjects if three sub...

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  20. In how many ways can 4 books be chosen from 12 books if (i) there is...

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