Question

find the sum of all off number from 1 to 150

Answer 1

$sum \: of \: 1 \: to \: 150 = \frac{150 \times 151}{2} \\ = 75 \times 151 = 11325 \: ans...$

Answer 2

Here,

The total no. is 150.

a=1, d=1.

Sn=n/2[2a+(n-1) d]

=> 150/2[2(1)+(150-1)1]

=> 75[2+149]

=> 75(151)

=> 11,325

Therefore, sum of all the numbers from 1 to 150 is 11,325.

Hope it helps. ✌✌☺☺