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# Aptitude - Permutation and Combination

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### Exercise

• General Questions
"Example is better than precept."
- (Proverb)
6.

In a group of 6 boys and 4 girls, four children are to be selected. In how many different ways can they be selected such that at least one boy should be there?

 A. 159 B. 194 C. 205 D. 209 E. None of these

7.

How many 3-digit numbers can be formed from the digits 2, 3, 5, 6, 7 and 9, which are divisible by 5 and none of the digits is repeated?

 A. 5 B. 10 C. 15 D. 20

8.

In how many ways a committee, consisting of 5 men and 6 women can be formed from 8 men and 10 women?

 A. 266 B. 5040 C. 11760 D. 86400 E. None of these

9.

A box contains 2 white balls, 3 black balls and 4 red balls. In how many ways can 3 balls be drawn from the box, if at least one black ball is to be included in the draw?

 A. 32 B. 48 C. 64 D. 96 E. None of these

10.

In how many different ways can the letters of the word 'DETAIL' be arranged in such a way that the vowels occupy only the odd positions?

 A. 32 B. 48 C. 36 D. 60 E. 120