Question

what is the sum of natural numbers from 31 to 50​

Answer 1

a(first term) =31

total numbers = 20 = n

common diffrence = 1 = d

the numbers from 31 to 50 are in ap

sum of n terms of ap = (an + n(n-1)d/2)

=> 31x20 + 20x19x1/2

=> 620 + 190

=> 810

Answer 2

Answer:

40 correct answer

Step-by-step explanation:

beacouse there is 31 to 50 =20 number so, 810/20=40