Question

arithmetic series find the correct sum
7+14+21...+98

Answer 1

answers
735
-25/3
-245/6

Answer 2

I guess you can do it girl..

In this series, first term a=7, last term l= 98 , common difference d = 7

You see that the sum of series will be,

n/2 (a+l)... We have to find n now, since 'l' is the last or nth term

l = a + (n-1). d

or, 98 = 7 + (n-1) * 7

or, 91 = 7 (n-1)

or, n-1 = 13

so, n= 14

Hence,

Sum= n/2 (a+l) = 14/2 (7+98) = 7 * 105 = 735

Answer 3

thanks

Answer 4

No problem.. anytime here to help