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Let the Random Variable for Number of Heads = X

X can be 0 , 1 , 2

Probability for Heads = P

Probability for Tails = 1 - P

$P(X=0) = (1-P)*(1-P) = (1-P)^{2}$

$P(X=1) = P*(1-P) + (1-P)*P = 2P(1-P)$

$P(X=2) = P*P = P^{2}$

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