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If the product of four consecutive terms in G.P. is 625. Find the first term.
1. 15
2. 25
3. 5
4. 35

1 Answer

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Best answer
Correct Answer - Option 3 : 5

Given :

4 consecutive numbers are in G.P

Concept used: 

For number in G.P common ratio is same like

a, ax, ax², ax³ in this series ratio is x.

Calculations: 

Let the numbers be a, ax, ax² and ax³

According to the question

a × ax × ax² × ax³ = 625

At x = 1

⇒ a⁴ = 625 = 5⁴

⇒ a  = 5

∴ The correct choice will be option 3.

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