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4 unbiased coins are tossed simultaneously. Obtain the probability distribution of the random variable 'numbers of head'.

Akshay
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    The number of heads is the number of successes in four independent trials with probability $1/2$ of success on each trial, so the distribution is $\mathrm{Bin}(4,1/2)$. ${}\qquad{}$ – Michael Hardy Aug 28 '14 at 15:57

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