20 Passengers Are To Travelled By A Doubled Decked Bus Which Can Acco

1.	20 Passengers Are To Travelled By A Doubled 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:
Answer» Those 5 who refuses to SIT in the upper deck will sit in LOWER deck So total lower deck remains: 2 Those 8 who refuses to sit in the lower deck will sit in upper deck So total upper deck sit remains: 5 These 7 PEOPLE can sit in 5 upper deck and 2 lower deck in: 7c5 * 2c2 ways i.e. 21 ways. Those 5 who refuses to sit in the upper deck will sit in lower deck So total lower deck remains: 2 Those 8 who refuses to sit in the lower deck will sit in upper deck So total upper deck sit remains: 5 These 7 people can sit in 5 upper deck and 2 lower deck in: 7c5 * 2c2 ways i.e. 21 ways.

20 Passengers Are To Travelled By A Doubled 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:

Answer»

Those 5 who refuses to SIT in the upper deck will sit in LOWER deck

So total lower deck remains: 2

Those 8 who refuses to sit in the lower deck will sit in upper deck

So total upper deck sit remains: 5

These 7 PEOPLE can sit in 5 upper deck and 2 lower deck in: 7c5 * 2c2 ways i.e. 21 ways.

Those 5 who refuses to sit in the upper deck will sit in lower deck

So total lower deck remains: 2

Those 8 who refuses to sit in the lower deck will sit in upper deck

So total upper deck sit remains: 5

These 7 people can sit in 5 upper deck and 2 lower deck in: 7c5 * 2c2 ways i.e. 21 ways.

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