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A box contains two white balls, three ...

A box contains two white balls, three black balls and four balls. In how many ways can three balls be drawn from the box, if atleast one black ball is to be included in the draw ?

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PREMIERS PUBLISHERS-COMBINATORICS AND MATHEMATICAL INDUCTION-EXERCISE 4.3
  1. A trust has 25 members . (i) How many ways 3 officers can be sel...

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  2. How many ways a committee of six persons from 10 persons can be chosen...

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  3. How many different selections of 5 books can be made from 12 differe...

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  4. How many different selections of 5 books can be made from 12 differe...

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  5. There are 5 teachers and 20 students. Out of them a committee of 2 tea...

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  6. There are 5 teachers and 20 students. Out of them a committee of 2 tea...

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  7. In an examination a student has a answer 5 questions, out of 9 quest...

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  8. Determine the number of 5 card combinations out of a deck of 52 car...

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  9. Find the number of ways of forming a committee of 5 members out of...

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  10. A committee of 7 peoples has to be formed from 8 men and 4 women. In ...

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  11. A committee of 7 peoples has to be formed from 8 men and 4 women. In ...

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

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  13. 7 relatives of a man comprises 4 ladies and 3 gentlemen, his wife also...

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  14. A box contains two white balls, three black balls and four balls. In...

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  15. Find the number of strings of 4 letters that can be formed with the le...

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  16. How many triangles can be formed by joining 15 points on the plane, in...

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  17. How many triangles can be formed by 15 points , in which 7 of them ...

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  18. There are 11 points in a plane. No three of these lies in the same ...

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  19. There are 11 points in a plane. No three of these lies in the same ...

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  20. A polygon has 90 diagonals. Find the number of its sides ?

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