Question

find the sum of all natural numbers between 200 and 1502 which are exactly divisible by 8.

Answer 1

The AP. for such numbers is 208,216,224,.................1496

Hence, a = 208

           d = 8

Let there be n numbers so, an = 1496

so, 208 + (n-1)8 = 1496

  Hence, n = 162

∴ Required sum = S162 = 162*(208+1496)/2 = 138024

Answer 2

Answer:

Step-by-step explanation:

The AP. for such numbers is 208,216,224,.................1496

Hence, a = 208

          d = 8

Let there be n numbers so, an = 1496

so, 208 + (n-1)8 = 1496

 Hence, n = 162

∴ Required sum = S162 = 162*(208+1496)/2 = 138024