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Assuming the balls to be identical excep...

Assuming the balls to be identical except for difference in colours, the number of ways in which one or more balls can be selected from 10 white, 9 green and 7 black balls is

A

880

B

879

C

630

D

629

Text Solution

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The correct Answer is:
B
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AAKASH SERIES-PERMUTATIONS & COMBINATIONS-EXERCISE-I
  1. If ""^(n)C(3)=10, then n is

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  2. If ""^(n)C(r) denotes the number of combinations of n things taken r t...

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  3. If ""^(8)C(3)+""^((n+2))C(4)=""^(9)C(4), then n is

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  4. IF C (2n, 3) : C (n,2) = 12 : 1, then n=

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  5. The number of ways in which a team of 6 players can be chosen from 11 ...

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  6. The number of diagonals in a polygon of 10 sides is

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  7. If these are 8 points on a circle, then number of different line seg...

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  8. If these are 8 points on a circle, Number of triangles formed by joi...

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  9. There are 10 parallel lines intersected by a family of 5 parallel line...

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  10. The number of rectangles formed in a chess board is

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  11. Assuming the balls to be identical except for difference in colours, t...

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  12. Numbar of different sums that can be formed with half rupee coin, a tw...

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  13. a man has 4 friends , in how many ways can he inivite one or ...

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  14. The number of divisors of 7! is

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  15. The sum of divisors of 2 ^5 3^4 5^3 is

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  16. The number of ways can 9 things be divided equally among 3 persons is

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  17. The number of ways in which 9 things can be divided into 3 equal group...

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  18. In how many ways can 52 cards be divided among 4 players so t...

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  19. The number of ways of awaring 9 scholarships among three students so t...

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  20. The number of ways of dividing 10 books into 3 group of 5,3,2,...

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