Question

Find the sum of first 26 terms of
the series 7+10+ 13+....​

Answer 1

Answer:

82

Step-by-step explanation:

d=3

an=a+(n-1) d

an=7(26-1)3

an=7+78-3

an=7+75

an=82

Answer 2

$\huge\underline\mathfrak\green{Answer}$

The sum of 26 terms of an A. P 7+10+13+..... is 1157.

Refer the attached picture for better understanding...