Question

If 6 term and 12 term of an ap are 13 and 25 then its first term is

Answer 1

Answer:

3

Step-by-step explanation:

a6=13

a+5d=13 (eq.1)

a12=25

a+11d=25 (eq.2)

Subtracting eq 1 from e1. 2

 a+11d=25

-a+ 5d=13

6d=12

d=2

putting value of d in eq.1

a+5(2)=13

a+10=13

a=3