Question

1+2+3+.......+100 then find out their sum?​

Answer 1

Answer:

s100 = 100/2(2a+n-1×d)=50×101=5050

Answer 2

Answer:

The answer will be 5050.

Step-by-step explanation:

We have given;

               a1 or first number = 1;

              a100 or last number = 100;

               total number = 100;

Hence, formula for their sum is equal to;

                S = n (a1 + a100) / 2;

                   = 100 (1 + 100) / 2;

                   = (100 * 101) / 2;

                   = 10100 / 2;

                   = 5050;

   

That's all