PMF, Expected Value, Variance - Important Example

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Tomorrow is paper you explain well i appreciate you for this act..

Pocketsocket
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Can anyone tell how the following is expected value equation:
E[X1^2*X2*X3]= E[X1^2]*E[X2*X3] + 2E[X1*X2]*E[X1*X3]
It will be great help if someone can explain...

monikayadav