Question

4. If 3rd, 8th and 13th terms of a GP are
p, q and r respectively, then which one
of the following is correct?​

Answer 1

Step-by-step explanation:

Formula,

a

n

=ar

n−1

Given,

a

3

=p=ar

3−1

=ar

2

a

8

=q=ar

8−1

=ar

7

a

13

=r=ar

13−1

=ar

12

q

2

=(ar

7

)

2

=a

2

r

14

.......(1)

pr=(ar

2

)(ar

12

)=a

2

r

14

.......(2)

comparing (1) and (2), we have,

q

2

=pr