Question

3. In an A.P., If a4 = 8 and a = 2, then the common difference is
(A) 6 (B) 4
c 2
(D) 10​

Answer 1

Answer:

nth term of the A.P. is given by,

a

n

=a+(n−1)d

∴a

4

=a+(4−1)d

∴8=2+3d (Given)

∴3d=6

∴d=2

Thus, common difference is 2.

Answer 2

nth term of the A.P. is given by,

a

n

=a+(n−1)d

∴a

4

=a+(4−1)d

∴8=2+3d (Given)

∴3d=6

∴d=2

Thus, common difference is 2.