Question

please write down all step to solve this
$1 + 3 + 5 + 7 + ...... + 17 =$

Answer 1

hey mate

here is your answer

l=a+(n-1)d

=>17=1+(n-1)2

=>16=(n-1)2

=>n-1=8

=>n=9

sum of the series=n/2(a+l)

where a=first term

l=last term

=>9/2(1+17)

=>9/2*18

=>9*9

=>81(answer)

#be brainly

thanks for the question