In a hotel there are four rooms Two single one double and one four seater In how many ways 8 people ...........

Quantitative Aptitude (CDS) Permutation & Combination

In a hotel, there are four rooms. Two single, one double, and one four-seater. In how many ways 8 people can live?

420

425

400

840

There is 8 person
so,
there is three possible combination
8c4 × 4c2 × 2c2
(8!/4!×4!) × (4!/2!×2!) ×(1)
=(8×7×6×5/4)
=420

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