Question

in A.P if a1= 2, a3 =26 find an​

Answer 1

Answer:

a=2

a

3

=a+2d=26

⇒2d=26−a=26−2=24

∴d=

2

24

=12

a

2

=a+d=2+12=14

∴a

2

=14

Answer 2

Answer:

a3 = a+ 2d

26 = 2 + 2d

26-2 = 2d

2d = 24

d = 12

an = a+(n-1)d

an = 2 + (n-1)12

an = 2+ 12n - 12

an = 12n - 10