Question

In an arithmetic progression if first term is 2 and 4th term is 8 then its common

difference will be______.​

Answer 1

Step-by-step explanation:

a⁴= 2+ (4-1)d

8= 2+3d

8-2=3d

6 =3d

d=2

Answer 2

a=2

a4=8

d=?

then,an=a+(n-1)×d

8=2+(4-1)×d

8=2+3d

3d=8-2

3d=6

d=2

hence, the common difference is 2