Wipro Company Numerical Ability Probability

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

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Wipro Other Question
The odds,against the ocurance of a head when a loaded coin is tosed are 3:5.The probability of getting a tail when the coin is tossed is
a)3/8 b)5/8 c)3/2 d)5/2 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