Answer :

Given that, X= no. of twos seen

So, on throwing a die three times, we will have X=0,1,2,3

P(X=1) = Pnot 2. Pnot 2. P2 + P 2. P2. Pnot 2 + P 2. Pnot 2. P 2

P(X=2) =Pnot 2. P2. P2 + Pnot 2. P2. P2 + P2. Pnot 2.P2

We know that,

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