25 a) Σ²/23 (5j + 2)³j-7 j=23 do not simplify the sum = 39 b) 237(i – 14)²/(i +31) = do not simplify the sum ¹3 c) Ei=4³=1 i(7j - 6j)j-¹ = simplify the sum 49 d) Σ{31 24% 7ij = = =1 j=0 simplify the sum

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