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To fill 12 vacancies, there are 25 candidates of which 5 are from scheduled caste. If three of the vacancies are reserved for scheduled caste candidates while the rest are open to all; the number of ways in which the selection can be made is a. `^5C_3xx^(22)C_9` b. `^22C_9-^5C_3` c. ^22C_3+^5C_3 d. none of these

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CENGAGE ENGLISH-PERMUTATIONS AND COMBINATIONS-All Questions
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  9. The number of ordered pairs of integers (x ,y) satisfying the e...

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  10. Prove that "^n Cr+^(n-1)Cr+...+^r Cr=^(n+1)C(r+1) .

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  15. The number of ways in which we can distribute m n students equally...

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