PROBABILITY

[ranjankumarnayak5]

There are six doors in a room. four boys have to come. in how many ways they can come in the room from different doors.
a.10
b.60
c.24
d.360

[Nikkita]

6*5*4*3=360 ways ans.

On 12 May 2016 14:51, "ranjankumarnayak5 [via Discussion forum]" <[hidden email]> wrote:

There are six doors in a room. four boys have to come. in how many ways they can come in the room from different doors.
a.10
b.60
c.24
d.360

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NAML

[ranjankumarnayak5]

why it is 3*4*5*6=360

[ranjankumarnayak5]

why it is 3*4*5*6=360

[Nikkita]

Because:
1st person can take any of the 6 doors
2nd person can take any of 5 remaining doors(because all have to their different doors as mentioned in question)
3rd person can take any of remaining 4 doors
4 the person can take any of remaining 3 doors only

So, by multiplication rule, its 6*5*4*3=360