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A die is thrown three times. Let X be ‘the number of twos seen’. Find the expectation of X.

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A die is thrown three times. Let X be ‘the number of twos seen’. Find the expectation of X. Select the correct answer from above options

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Given that, X= no. of twos seen So, on throwing a die three times, we will have X=0,1,2,3 P(X=2) =Pnot 2. P2. P2 + Pnot 2. P2. P2 + P2. Pnot 2.P2

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