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In a singing competition a group of 10 p...

In a singing competition a group of 10 pepole, participate, each person has exactly one friend and rest are strangers, the probability that both the singers of the duet are complete strangers is

A

`1/15`

B

`1/45`

C

`8/9`

D

`22/45`

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The correct Answer is:
C
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