Question

find the sum of first n term of an a.p whose term is 1 and comman difference is 3​

Answer 1

this your answer

Step-by-step explanation:

மலமமஞ மஹஜடள

யளயறயய

ளற6

ளய7யளறற8

8=5-4ழ

வள

Answer 2

Step-by-step explanation:

$sum \: \: of \: \: n \: \: terms \: \: of \: \: the \: a.p \: \: = \frac{n}{2} (2a + (n - 1)d)$

$= > \frac{n}{2} (2 \times 1 + 3n - 3)$

$= > \frac{n}{2} (3n - 1)$

Hence the required answer. I hope it will help you. Thank you