Random variable question

ahahs

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Let A1, A2, · · · , An be independent and identically distributed random variables where E(A1) = µ. Also, let T = A1 + A2 + · · · + An.

(a) Compute E(A1A2A3A4|A1). The answer should be expressed in terms of A1

(b) Simplify E(A1|T) + E(A2|T) + · · · + E(An|T)
 
Let A1, A2, · · · , An be independent and identically distributed random variables where E(A1) = µ. Also, let T = A1 + A2 + · · · + An.

(a) Compute E(A1A2A3A4|A1). The answer should be expressed in terms of A1

(b) Simplify E(A1|T) + E(A2|T) + · · · + E(An|T)
Please show us what you have tried and exactly where you are stuck.

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