Question

if the nth term of an A.P an=2n-1 then it's S4 is​

Answer 1

Step-by-step explanation:

a1= 1, a2=3, a3=5

d= 2

Sn=n/2 {2a + (n-1)d}

S4=4/2 {2×1 +(4-1)2}

=2 (2+3×2)

=2×8

=16