Wipro Company Numerical Ability Probability

A puzzle in logic was given to 3 students A,B and C whose chances of solving i are 1/2,3/4 and 1/4 respectively.The probability that the problem is solved is.
a)29/32 b)31/32 c)1/8 d)7/8

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Wipro Other Question
There are 25 bulbs,out of which 2 are fused.If 2 bulbs are drawn at random the probability of drawung one good and one fused bulb is
a)7/13 b)5/13 c)23/150 d)7/15 A die has 2 of its sides painted pink,2 blue and 2 green.If the die is rolled twice the probability that same colour appears both the times is
a)1/3 b)2/3 c)7/9 d)8/9