Question

find the sum of natural number between 250 to 900 which are divisible by 13​

Answer 1

Answer:

260+273+286+299+.........+897 ⇒ n(n+1)/2 ⇒ 897(897+1)/2 ⇒ 897(898)/2                 ⇒ 897(449) ⇒ 402735

Step-by-step explanation: