CBSE Class 11-science Answered
can i get the derivation of the formula n(n+1)/2
Asked by dhruvisha sagothia | 03 Oct, 2013, 01:08: PM
Expert Answer
Sum of first n natural numbers = n(n+1)/2
Derivation:
S = 1 + 2 + 3 + ... + n
S = n + (n-1) + ... + 2 + 1
Adding column wise, we get,
2S = (n+1) + (n+1) + (n+1) + ... ... + (n+1) (n times)
2S = n(n+1)
S = n(n+1) / 2
Answered by | 03 Oct, 2013, 01:50: PM
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