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Poor Dollys T.V. has only 4 channels, al...

Poor Dollys T.V. has only 4 channels, all of them quite boring. Hence it is not surprising that she desires to switch (change) channel after every one minute. Then find the number of ways in which she can change the channels so the she is back to her original channel for the first time after 4 min.

A

27

B

31

C

23

D

33

Text Solution

Verified by Experts

The correct Answer is:
B
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