The third term of a G.P. is 9. The product of its first five terms is

  1. 35
  2. 39
  3. 310
  4. 312

Answer (Detailed Solution Below)

Option 3 : 310
Free
NDA 01/2025: English Subject Test
30 Qs. 120 Marks 30 Mins

Detailed Solution

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Concept:

Five terms in a geometric progression:

If a G.P. has first term a and common ratio r then the five consecutive terms in the GP are of the form  .

 

Calculation:

Let us consider a general geometric progression with common ratio r.

Assume that the five terms in the GP are .

It is given that third term is 9.

Therefore, a = 9.

Now the product of the five terms is given as follows:

But we know that a = 9.

Thus, the product is .

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