16. A problem of mathematics is given to three students whose chances of solving the problem are 1/3, 1/4 & 1/5 respectively. The probability that the question will be solved is :

(a) 2/3

(b) 3/4

(c) 4/5

(d) 3/5

17. A speaks truth in 75% cases and B in 80% cases. In what % of cases are they likely to contradict each other in stating the same fact.

(a) 5 %

(b) 55 %

(c) 35 %

(d) 45 %

18. Six boys and six girls sit in a row. What is the probability that the boys and girls sit alternatively.

(a) 1/462

(b) 1/924

(c) 1/2

(d) none of these

19. A man and a woman appear in an interview for 2 vacancies in the same post. The prob. of man’s selection is 1/4 and that of woman’s selection is 1/3. What is the probability that none of them will be selected ?

(a) 1/2

(b) 1/12

(c) 1/4

(d) none of these

20. 3 dice are thrown simultaneously. What is the probability of obtaining a total of 17 or 18 ?

(a) 1/9

(b) 1/72

(c) 1/54

(d) none of these

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