Wipro Company Numerical Ability Pipes and Cistern

If a card is drawn from a well shuffled pack of cards,the kprobability of drawing a spade or a king is
a)19/52 b)17/52 c)5/13 d)4/13

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Wipro Other Question

The odds against Arun solving a problem are 5:7 and the odds in favor of Prashant solving the same problem are 4:3.The probability that only one of them can solve the problem is
a)13/84 b)41/84 c)17/84 d)23/84
Out of first 20 natural numbers,one number is picked at random.The probability that it is wither an even number or a prime number is
a)1/2 b)16/19 c)4/5 d)17/20