The Sum of All Natural Numbers from 75 to 97 is:

  1. 1958
  2. 1598
  3. 1798
  4. 1978
Monis Rasool Professor Asked on 9th October 2015 in Maths.
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1 Answer(s)

Answer: (4) 1978

Explanation:-
Formula-
The sum of the arithmetic sequence Sn = n (a1 + an)/2
Where, a1 = first number of sequence & an = last number of sequence.

Then, the sum of 75 to 97,
a1 = 75,   n = 23 & an = 97

The sum of 75 to 97 = 23 (75 + 97)/2
= 23 x 172/2
= 23 x 86
= 1978

Hence, the answer is (4) 1978.

Anurag Mishra Professor Answered on 10th October 2015.
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