Question

Find the sum of the series
whose first term, last term and
digit of the term are following
2,37,40​

Answer 1

Answer:

n=40            a=2      l=37

Sₙ=n/2 (a+l)

Sₙ=40/2(2+37) = 20*39

Sₙ=780

Step-by-step explanation: