$A$ coin is tossed twice in succession. Let $X$ represent the number of tails in two tosses,then the probability distribution of $X$ is given by
- A
$X=x_i$ $0$ $1$ $2$ $P_i$ $1/2$ $1/4$ $1/4$ - B
$X=x_i$ $0$ $1$ $2$ $P_i$ $1/3$ $1/3$ $1/3$ - C
$X=x_i$ $0$ $1$ $2$ $P_i$ $1/4$ $1/4$ $1/2$ - D
$X=x_i$ $0$ $1$ $2$ $P_i$ $1/4$ $1/2$ $1/4$
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