Wipro Company Numerical Ability Probability

If A and B are two mutually exclusive events such that P(A)=5 P(B),then P(AUB):P(B)=
a)6:1 b)5:6 c)6:11 d)5:11

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Wipro Other Question
If 4 coins are tossed,the probability of getting 2heads and 2 tails is
a)3/8 b)6/11 c)2/5 d)4/5 if P(A) = p and P(B)=q,then P(A`UB`)(when A and B is independent) is
a)pq b)(1-p)(1-q) c)1-pq d)none