Question

in an A.p if an =3+4n find S3 ( A1+ A2+A3)​

Answer 1

Answer:

33

Step-by-step explanation:

An = a plus (n-1)d

N=1

A=3+4 =07

N=2

An = 3+4n

A2 = 11

D=11-7 = 4

S3 = n/2(2a + (n-1)d)

S3 = 3/2(14 + 8 ) = 33