Question

The sum of the series 3 ½ + 7 + 10 ½ + 14 + …. to 17 terms is​

Answer 1

7/2+7+21/2+14

=7/2+(7-1)×7/2

=7/2+6×7/2

=7/2+21

=7+49/ whole divided by 49/2.

Then we apply sum formula

=7/2+49/2=7+49 whole divided by 2

=56/2 =28

so 28 is the answer