Question

PLEASE HELP!! EVALUATE

A. 36

B. 8

C. 24

D. 40

Answer 1

The sum of integers n from n1 to n2 is given by the Gauss formula

`\sum_(k=n1)^(n2)k=(n2-n1+1)(n2+n1)/(2)`

`=(8-1+1)(8+1)/(2)`

`=(8)(9)/(2)`

=36