Question: Let X 1 , X 2 , . . . , X 6 be independent random variables such that: P ( Xi = - 1

Let X1, X2,..., X6 be independent random variables such that:
P(Xi=-1)=P(Xi=1)=1/2, i =1,2,3,4,5,6
Then P( Summation from X=1to6is equal to4

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