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

**Answer: (4) 1978**

**Explanation:-
**

**Formula-**

**The sum of the arithmetic sequence S**

_{n}= n (a_{1}+ a_{n})/2**Where, a**

_{1}= first number of sequence & a_{n}= last number of sequence.Then, the sum of 75 to 97,

a_{1} = 75, n = 23 & a_{n} = 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.