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in Arithmetic Progression by (40.3k points)
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Find the sum of the first ‘n’ natural numbers and hence find the sum of the first 20 natural numbers.

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Best answer

The first 'n' natural numbers are 1, 2, 3, ... , n.

This sequence is an A.P. with a = 1, d = 2 – 1 = 1

\(\therefore\) The sum of first ‘n’ natural numbers is n(n + 1)/2 and the sum of first 20 natural numbers is 210.

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