Question: Find the formula for the summation E i(i + 1). Hint: i(i+1) = ( (i+1) i 1 )/3

Find the formula for the summation E" i(i + 1). Hint:

Find the formula for the summation E" i(i + 1). Hint: i(i+1) = ( (i+1) i 1 )/3

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