#531 - Switch Or Not Puzzle

You are presented with three boxes. One of them has a red ball inside and the other two have a black ball inside each of them. You are asked to pick up the one with red ball and you pick one. Now, one of the other boxes is opened and it is found to have a black ball.

You are presented with a chance to change your box with the one that is left closed. Will you change your box? Why or why not?

View Answer Discuss

When you picked up a random box, the probability that the red ball was inside was 1/3.
The chance that red ball was inside one of the two left boxes was 2/3. One box is opened and it is found to have a black ball.

Now you still have a probability of 1/3 that the ball inside your box is red. While the other box has a probability of 2/3 that the red ball is inside since the box that was opened has been taken out.

Thus, you must change the boxes and you will double the chances of getting a red ball.

#532 - Weird Boy Behavior Riddle

A police officer was passing by when he saw a guy hiding. He walked up to him and genially asked, "What is your name?"

"Shut up!" the boy responded.

"Where are your manners?" asked the outraged police officer.

"Up that tree," said the boy discourteously, directing to a neighbouring tree.

"You"re looking for trouble, aren"t you?" said the police officer.

"No, trouble is looking for me!" the boy answered solemnly.

Why is the boy behaving like this?

View Answer Discuss

The boy is not behaving rudely. His name is "Shut Up", and he is playing hide-and-seek with two of his friends - "Manners" and "Trouble". "Trouble" is the one who counted, so now he is looking for the other two boys. "Manners" is hiding up the tree.

#533 - Logical Brain Bat

The following "Brain Bat" means Slow Down.
S
L
O
W

Using the same logic, can you tell us what does the following Brain Bat means ?
E
V
I
G

View Answer Discuss

Read downwards, SLOW means slow down.
Read upwards, EVIG (GIVE) will mean Give Up.

#534 - Find The Next number In The Series

Find the next number in the following series:
6, 14, 26, 98, __?

View Answer Discuss

The next number will be 276.

6 = 1^1 + 2^1 + 3^1
14 = 1^2 + 2^2 + 3^2
36 = 1^3 + 2^3 + 3^3
98 = 1^4 + 2^4 + 3^4
276 = 1^5 + 2^5 + 3^5

#535 - Mathematical Symbols Riddle

Can you make the number 24 by utilizing the numbers 1, 3, 4 and 6? You must use one number only one time and you can use mathematical operation symbols anytime anywhere.

View Answer Discuss

6/(1 - 3/4) = 24

#536 - Widow Sister Riddle

Can a man marry his widow"s sister legally in India?

View Answer Discuss

No, he cannot. If his wife is widow, it means that he is already dead.

#537 - Cab Driver Riddle

A cab driver was moving in the wrong direction on a one-way road. A police officer was standing nearby. He noticed the driver but he let him go.

Why did the police officer not fine him or stop him?

View Answer Discuss

This is because the cab driver was on foot. It is not mentioned that the cab driver was driving his cab in the question and that makes perfect sense.

#538 - Trivia Number Riddle

A special integer exists in mathematics that shows a special property. If you subtract any number from that integer, the result will always be divisible by the successor of that number completely.

Do you know what that integer is ?

View Answer Discuss

The required integer is -1.

For an example, let us subtract 7 from -1.

-1 - 7 = -8

Now the successor of 7 is 8 and (-8) is exactly divisible by 8.

You can try that for any number and it will hold true.

#539 - Blocks Sequence Puzzle

Can you find out which options fits best with the missing column?

Blocks Sequence Puzzle
View Answer Discuss

Option "d" will fit in the missing space.

What is happening here? In every next column, the order is getting reversed and the lowest digit is omitted.

#540 - How Many Balls Problem

In the drawer beside your bed, you have three orange, two pink and five purple balls. There is no electricity and the room is completely dark. How many balls you must take out to make sure you have one ball of each color at least.

View Answer Discuss

9

2 < 3 < 5
To find out the required number of balls, take one in place of the least number (i.e. take one pink ball) and then add all the greater numbers (i.e. three orange and five purple balls) to it.

Required number of balls = 1 + 3 + 5 = 9.