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The fourth, seventh and the last term of...

The fourth, seventh and the last term of a G.P. are 10, 80 and 2560, respectively. Then the first term and number of terms in the G.P. are, respectively,

A

`(5)/(4)` , 10

B

`(5)/(4) ,12`

C

`(4)/(5) ,10`

D

`(4)/(5) ,12`

Text Solution

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The correct Answer is:
B
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