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Deepak Bora
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Find the sum of first n natural numbers.

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This is the Important question based on Arithmetic progression Chapter of R.S Aggarwal book for ICSE & CBSE
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In this Question you have to find the sum of first n natural numbers.
This is the Question Number 13 Of Exercise 11 D of RS Aggarwal Solution.

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1 Answer

  1. Sn=1+2+3+....+n

    Sn=2n[2a+(n1)d] where a=1,d=21=1

    Sn=2n[2×1+(n1)1]

    Sn=2n(n+1)

     Sum of first n natural numbers=2n(n+1)

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