a ) Find a formula for 1 1 2 1 2 3 1 n ( n 1 ) by examining the values of this expression for small values of n b ) Prove the formul

Question

a ) Find a formula for 1 1 2   1 2 3     1 n ( n   1 ) by examining the values of this expression for small values of n   b ) Prove the formul

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a ) Find a formula for 1 1 2 + 1 2 3 + + 1 n ( n + 1 ) by examining the