Question

If nth term of an AP is 1/3(2n+1) then sum pf its 19th term is

Answer 1

Answer:

here is your answer mate .

Answer 2

Given; the nth term of an AP is 1/3(2n+1)

To Find; Sum of 19 terms

Solution; nth term of an AP is 1/3(2n+1)

For first-term put the value of n as 1

a1=1/3(2n+1)

=1/3*3=1/9

For the last term, e 19th term put n=19

a19=1/117

Sum of 19terms =19(a+an)/2

19(0.06)

1.14

Hence the sum of 19terms is 1.14