Question

Q. The product of 1st five terms of an increasing AP is 29160. If the first, second and fourth terms of the AP are in GP, then what is the sum of first 11 terms of the AP? A. 242 B. 264 C. 253 D. 275
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Answer 1

Answer:

Let the G.P. is

⇒a,ar,ar

2

,ar

3

,ar

4

⇒Given, the third term of G.P. is 4

⇒That means ar

2

=4

⇒Product of first five terms = a

5

× r

10

= (ar

2

)

5

= 4

5

=1024

may be it's like this