Question

The formula S = (+1)/2 can be used to find the sum of the first n natural numbers. Find the sum of the first 20 natural numbers.

Answer 1

formula to find sum of any AP is

N/2(2a+(n-1)d)

for first 20 natural numbers , a=1,d=1 and n=20

=20/2(2×1+(20-1)×1)

=210 answer

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