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A fair coin is tossed 4 times. If X deno...

A fair coin is tossed 4 times. If X denotes the number of heads obtained, then the formula for p.m.f. of X is

A

`f(x)={{:((1)/(16)""^(4)C_(x)","x=0","1","2","3","4),(0", otherwise"):}`

B

`f(x)={{:((1)/(8)""^(4)C_(x)","x=0","1","2","3","4),(0", otherwise"):}`

C

`f(x)={{:((1)/(4)""^(4)C_(x)","x=0","1","2","3","4),(0", otherwise"):}`

D

`f(x)={{:((1)/(2)""^(4)C_(x)","x=0","1","2","3","4),(0", otherwise"):}`

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The correct Answer is:
A
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