Question

Find the sum of 1st 11 terms of the ap 1/15,1/12,1/10

Answer 1

Step-by-step explanation:

Given- a= 1/15

d =1/60

so,

S11 = n/2{2a+(n-1)d}

=11/2 {2/15 +1/6}

= 11/2 ×9/30

=99/30

=33/20