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Passengers are to travel by a double dec...

Passengers are to travel by a double decked bus which can accommodate 13 in upper deck and 7 in the lower deck. The number of ways that they can be distributed if 5 refuse to sit in the upper desk and 8 refuse to sit in the lower deck is :

A

25

B

21

C

18

D

15

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The correct Answer is:
B
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