Questions
20 passengers are to travel by a double decked bus which can accommodate 13 in the 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 deck and 8 refuse to sit in the lower deck is
detailed solution
Correct option is B
Passengers refusing to sit in the lower deck (resp. upper deck) will sit in the upper deck (resp. lower deck)5 passengers will sit only in the lower deck and 8 passengers will sit in the upper deck. Remaining passengers =20-(5+8)=7Seats remaining in lower deck=7−5=2 number of ways of filling 2 seats in the lower deck =C2 7=21Corresponding to each choice, the remaining 5=7–2 passengers will sit in the upper deck. number of choice =21Similar Questions
Let be a set containing elements. The number of reflexive relations that can be defined on is
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