Question

27) For G.P., r=3, a=2 then t5
=...​

Answer 1

Step-by-step explanation:

ar(1+r

3

)=216 and

ar

5

ar

3

=

4

1

⇒r

2

=4⇒r=2,−2

when r=2 then 2a.(9)=216∴a=12

when r=−2, then −2a(1−8)=216

Thus,a=

14

216

=

7

108

, which is not an integer.

Therefore, a=12