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From a class of 15 students, 10 are to b...

From a class of 15 students, 10 are to be chosen. There are 3 students who decide that either all of them will select or non of them will select. In how many ways can they be chosen?

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NAGEEN PRAKASHAN ENGLISH-PERMUTATION AND COMBINATION -Exercise G
  1. In how many ways can 7 red and 6 black balls be arranged in a row, if ...

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  2. In how many ways can 12 white and 8 black balls be arranged in a row i...

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  3. A person invites a group of 10 friends at dinner and seats (i) 5 on ...

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  4. In an examination a minimum is to be secured in ech of 5 subjects for ...

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  5. It is necessary to pass in each subject out of 7 subjects in an examin...

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  6. Find the number of ways of getting 2 heads and 4 tails in 6 throws of ...

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  7. How many factors are there of the number 2520?

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  8. How may other factors are there of the number 37800?

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  9. Out of 4 mangoes, 5 bananas and 6 guava, find (i) number of ways in ...

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  10. There are 4 red, 3 black and 5 white balls in a bag. Find the number o...

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  11. There are 4 white, 3 black and 3 red balls in a bag. Find the number o...

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  12. In how many ways can 8 books be divided between 2 students, if they ge...

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  13. Find the number oif different sums that can be formed with one rupee, ...

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  14. How many different amounts can be formed with one-one coin of Rs 1, Rs...

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  15. In how many ways can 12 books be divided in 3 students equally?

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  16. In a plane there are 37 straight lines, of which 13 passes through the...

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  17. Find the number of (i) combinations. (ii) permutations of four lette...

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  18. Find the number of words formed containing 4 letters taken from the le...

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  19. In an electrion the coinvencing will be done by 20, 25 and 30 persons ...

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  20. From a class of 15 students, 10 are to be chosen. There are 3 students...

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