# The sum of an infinite geometric series of real number is 14, and the sum of the cube of the terms of this series is 392 then the first term of the series is Option 1) -14 Option 2) 10 Option 3) 7 Option 4) -5

As learnt in

Sum of infinite terms of a GP -

- wherein

first term

common ratio

Also if series is

Divide  and

For

Option 1)

-14

This option is incorrect.

Option 2)

10

This option is incorrect.

Option 3)

7

This option is correct.

Option 4)

-5

This option is incorrect.

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