# Can you guess what is his room number ?

–1 vote
884 views

It was the first day of our second semester and we were looking for our hostel room numbers allotted, we saw that one of our friend was already allotted the room number last night and he challenged us to guess his new room number. We gave following answers

135, 780, 785 and 732.

He said, “That’s amazing”, “You’ve each guessed exactly one digit correctly and in its right place!”
Now can you guess what is his room number ?

posted May 15, 2014

For first digit there is just one option '1' as other three no's start with 7
The second digit can't be 3 (there is EXACTLY one digit correct in all answers) otherwise the first guess will have two digits correct; so second digit is '8'
Going with this same logic last digit cannot be '5' or '0'; so its '2'

you excelled yourself!

182
For first digit there is just one option '1' as other three no's start with 7
The second digit can't be 3 (there is EXACTLY one digit correct in all answers) otherwise the first guess will have two digits correct; so second digit is '8'
Going with this same logic last digit cannot be '5' or '0'; so its '2'

Similar Puzzles

You are standing in front of a room with one light bulb inside of it.
You can not see if it is on or off.
Outside the room there are three switches in the off positions.
You may turn the switches any way you want to.
You stop turning the switches, enter the room and know which switch controls the light bulb. how?

+1 vote

There are 13 caves arranged in a circle. There is a thief hiding in one of the caves. Each day the the thief can move to any one of of the caves that is adjacent to the cave in which he was staying the previous day. And each day, you are allowed to enter any two caves of your choice.

What is the minimum number of days to guarantee in which you can catch the thief?

Note: Thief may or may not move to adjacent cave. You can check any two caves, not necessarily be adjacent. If thief and you exchange your caves, you will surely cross at some point, and you can catch the thief immediately.

+1 vote

You have a flashlight that takes 2 working batteries. You have 8 batteries but only 4 of them work.

What is the fewest number of pairs you need to test to guarantee you can get the flashlight on?

In an ODI Cricket World Cup finale, India were given a stiff target of 405 runs by Australia to chase . As India is quite good at chasing, India was on the brink of victory, thanks to the two chase masters of India – Virat Kohli and M.S. Dhoni . India were 403 for the loss of 3 wickets in 49.4 overs . So, India needed just three runs in two balls . This was not a big deal for the two talismanic batsman, however, both of them were facing a problem . Virat Kohli was not out on 198 and M.S. Dhoni was playing on 97 . Kohli was going to take the strike for the next ball . Both the batsman after chatting for a few minutes came out with a plan such that Virat Kohli can get a double century, M.S. Dhoni can get a century and also India wins the match, with the two batsman remaining not out.

Can you guess what was the plan?

Assumptions:

1. Both the remaining balls will be legal, i.e., no wide, no noballs .
2. Only three runs is required of the final two balls .
+1 vote

Rohan is on his way to visit his girlfriend, who lives at the end of the state.It's her birthday, and he want to give her the cakes that he has made.Between his place and her girlfriend's house, he need to cross 7 toll bridges.
Before you can cross the toll bridge, you need to give them half of the cakes you are carrying, but as they are kind trolls, they each give you back a single cake.

How many cakes do Rohan have to carry with him so he can reach his girlfriend's home with exactly 2 cakes?