Q8 of 60 Page 21

Let Sn denote the sum of the cubes of first n natural numbers, and sn denote the sum of first n natural numbers. Then write the value of

To find


Let I = …… (1)


Given,




Substituting in equation (1)






We know by property that:


∑axn + bxn - 1 + cxn - 2…….d0=a∑xn + b∑xn - 1 + c∑xn - 2…….. + d0∑1


Thus



And We know




Substituting the values






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