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Probability – 1 – 8

36. A bag contains 3 red, 4 white and 5 blue balls. All balls are different. Two balls are drawn at random. The probability that they are of different colour, is :

(a) 47/66
(b) 10/33
(c) 5/22
(d) none of these

Answer
Answer : (a)

Explanation
No answer description available for this question. Let us discuss.

37. In order to get atleast once a head with probability ≥0.9, the number of times a coin needs to be tossed, is :

(a) 3
(b) 4
(c) 5
(d) none of these

Answer
Answer : (b)

Explanation
No answer description available for this question. Let us discuss.

38. Odds 8 to 5 against a person who is 40 years old living till he is 70 and 4 to 3 against another person now 50 till he will be living 80. Probability that one of them will be alive next 30 years, is :

(a) 59/91
(b) 44/91
(c) 51/91
(d) 32/91

Answer
Answer : (b)

Explanation
No answer description available for this question. Let us discuss.

39. In a certain town, 40% of the people have brown hair, 25% have brown eyes and 15% have both brown hair and brown eyes. If a person selected at random from the town, has brown hair, the probability that he also has brown eyes, is :

(a) 1/5
(b) 3/8
(c) 1/3
(d) 2/3

Answer
Answer : (b)

Explanation
No answer description available for this question. Let us discuss.

40. A six faced dice is biased that it is twice as likely to show an even number as an odd number when thrown. It is thrown twice. The probability that the sum of two numbers thrown is even, is :

(a) 1/12
(b) 1/6
(c) 1/3
(d) 2/3

Answer
Answer : (d)

Explanation
No answer description available for this question. Let us discuss.

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