Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 11-science Answered

A room has 5 doors. In how many ways can a man enter the room through one and come out through a different door?
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
answered-by-expert Expert Answer

The man has to perform two jobs in succession:

 

1)     He has to enter the room, then

2)     He has to come out from the room

 

Clearly, a person can enter the room through anyone of the 5 doors, So he can perform first job in 5 ways.  After entering into the room, the man can come out through a different door in 4 ways.

 

Hence the number of ways in which a man can enter a room through one door and come out through a different door = 5 x 4 = 20

Answered by | 04 Jun, 2014, 03:23: PM
CBSE 11-science - Maths
Asked by Kchawla94 | 28 Feb, 2019, 08:07: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by samyakagarwal7may | 12 Oct, 2018, 11:45: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by Topperlearning User | 24 Nov, 2015, 12:14: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by Topperlearning User | 12 Sep, 2016, 11:52: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 11-science - Maths
Asked by Topperlearning User | 04 Jun, 2014, 01:23: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
Get Latest Study Material for Academic year 24-25 Click here
×