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5
∑5i = 5*(1+2+3+4+5) = 5*5*6/2 = 75
1
5
∑(i+2) = (1+2)+(2+2)+(3+2)+(4+2)+(5+2) = 5*6/2+10 = 25
1
5
∑2^i = 2^1+2^2+2^3+2^4+2^5 = 2+4+8+16+32 = 62
1