Question

The sum of first n terms of an ap is 3n^2+4. Find th 25 term

Answer 1

Answer:

55

Step-by-step explanation:

if last term sn=3n2 + 4

then,

S1=7,S2=16

also we know that S1=A1 ,so

A1=7 and S2-S1=A2

SO, A2=9

commom difference = 2

as, we find that

A25=a+24d

7+24*2=55

hope its help u...