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The probability of a candidate passing a...

The probability of a candidate passing an examination at any one attempt is `3/5`.He carries on entering until he passes and each entry costs him Rs. 1. The expected cost of his passing the exam is (in Rs)

A

`25/9`

B

`5/3`

C

`125/27`

D

`625/81`

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The correct Answer is:
B
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