The sum of first 45 natural numbers is: Options: A . &nbsp1035 B . &nbsp1280 C . &nbsp2070 D . &nbsp2140

The sum of first 45 natural numbers is:

Question

The sum of first 45 natural numbers is:

Options:

A . 1035

B . 1280

C . 2070

D . 2140

Answer: Option A

Let S_n = (1 + 2 + 3 + ... + 45)

This is an A.P. in which a = 1, d = 1, n = 45 and l = 45

S_n = n (a + l) = 45 x (1 + 45) = (45 x 23) = 1035 2 2

Required sum = 1035.

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