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In a 12 storey house 10 people enter the...

In a 12 storey house 10 people enter the lift cabin. It is known that they will leave the lift in pre-decided groups of 2, 3 and 5 people at different storeis. The number of ways they can do so if the lift does not stop upto the second storey is

Text Solution

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Total possible values`=.^10C_3*3!`
`=(10!)/(7!3!)*3!`
`10*9*8=720`
Option 2 is correct.
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