Question

if a is first term and an is last term then Sn=​ plz slv this

Answer 1

Answer:

$\frac{n}{2} (2a + (n - 1)d)$

or

$\frac{n}{2} (a + an)$

where n is the no of terms

a is the first term

an is the last term

this is the required answer hope it helps