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4. 1 (a) Use the identity to find a formula for the partial sum k(k + 1) K k+1 Sn = LK= 1 R(K+1 )

4. 1 (a) Use the identity to find a formula for the partial sum k(k + 1) K k+1 Sn = LK= 1 R(K+1 ) 1 (b) Find n(n + 1) n=1 n(n + 2) (c) Use a similar trick to evaluate In (n + 1)2 n=1

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