The first term and the last term of a GP...

The first term and the last term of a GP are a and k respectively. If the number of terms be n, then n is equal to (`r to` common ratio),

A

`1-(logk-loga)/(logr)`

B

`1+(loga+logk)/(logr)`

C

`1+(logk-loga)/(logr)`

D

`logr=logk-loga`

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The correct Answer is:

C

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