Wipro Company Numerical Ability Probability

The probability of getting atleast one head when 4 fair coins are tossed is
a)1/16 b)15/16 c)3/16 d)7/16

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Wipro Other Question
The probability of getting exactly 2 heads when 2 coins are tossed is
a)1/2 b)1/4 c)3/4 d)1/3
 The probability of getting atleast one head,where a loaded coin is tossd twice(given that head occurs twice as often as tails) is
a)7/9 b)8/9 c)4/9 d)2/9