Question

find the sum of the first 45 terms of an ap in his third term is 6 and 7 term is 22

Answer 1

$\huge\mathfrak{Answer \ :-}$

$\tt{See \ the \ Attachment.}$

$\mathsf{The \ answer \ is \ 3870.}$

$\huge\mathbb{Hope \ this \ helps.}$