top button
Flag Notify
    Connect to us
      Facebook Login
      Site Registration Why to Join

    Get Free Puzzle Updates

Facebook Login
Site Registration

What is the probability that room number starts with 1, 2 or 3 and ends with 4, 5 or 6?

+3 votes
561 views

In a hotel, rooms are numbered from 101 to 550. A room is chosen at random. What is the probability that room number starts with 1, 2 or 3 and ends with 4, 5 or 6 ?

posted Nov 10, 2013 by Anuj Yadav

Share this puzzle
Facebook Share Button Twitter Share Button Google+ Share Button LinkedIn Share Button Multiple Social Share Button

4 Answers

+3 votes
 
Best answer

Out of which 299 room number starts with either 1, 2 or 3. (as room number 100 is not there) Now out of those 299 rooms only 90 room numbers end with 4, 5 or 6

So the probability is 90/450 i.e. 1/5 or 0.20

answer Nov 10, 2013 by Vikas Upadhyay
+2 votes

Total favorable ways 3c1*10c1*3c1 i.e. 3*10*3 = 90
So probability = 90/450 or 9/45

answer Nov 10, 2013 by Salil Agrawal
0 votes

The probability is 90/450 i.e. 1/5 or 0.20

Where 450 are total number of room and 90 rooms starts with 1, 2 or 3 and ends with 4, 5 or 6

answer Nov 16, 2013 by Neeraj Pandey
0 votes

as rooms started from 101 to 550, it means there are 5 floors and each floor has 50 rooms.
total rooms are 250.
no. of rooms started with 1,2 &3 and ends with 4,5,6 are 75.
thus, (75/250)*100=30%
so, probabilty is 30%

answer Apr 21, 2016 by Pranali Nikam



Similar Puzzles
0 votes

A bag contain 5 blue and 4 black balls. Three balls are drawn at random. What is the probability that 2 are blue and 1 is black.

+1 vote

A bag contains 5 white, 4 red and 3 black balls. A ball is drawn at random from the bag, what is the probability that it is not black?

0 votes

My house number is such that, when divided by 2, 3, 4, 5 or 6 it will always leave a remainder of 1.

However, when divided by 11 there is no remainder.
What is my house number?

0 votes

I have two coins.
* One of the coin is a faulty coin having tail on both side of it.
* The other coin is a perfect coin (heads on side and tail on other).

I blind fold myself and pick a coin and put the coin on table. The face of coin towards the sky is tail.

What is the probability that other side is also tail ?

Contact Us
+91 9880187415
sales@queryhome.net
support@queryhome.net
#280, 3rd floor, 5th Main
6th Sector, HSR Layout
Bangalore-560102
Karnataka INDIA.
QUERY HOME
...