Question

the sum of the series 1+7+3+10+5+13+7+16......to 30 terms is​

Answer 1

Answer:

We know that Sn=n/2[2a+(n-1)d]

Here n=30

a=1

d=7-1=6

So Sn=30/2[2+(30-1)6]

=15(2+29×6)

=15(2+174)

=15×176

=2640

Answer 2

Answer:

92

Step-by-step explanation:

1+7+3+10

=21

21+5+13+7

=46

46+16

=62

62+30

=92