Question

SUM OF THE SERIES OF 1+3+5.... to 25

Answer 1

hello friend!!
here's the solution...
I hope it helps you....

Answer 2

$a+(n-1)d=25$
$1+2n-2=25$
$n=13$

$Sn=13/2 (1+25)$
$Sn=13/2×26=169$

THE ANSWER IS 169