Mind Teasers : Coin Probability Brain Teasers

Difficulty Popularity

You keep tossing a fair coin for twenty times. Each time, the coin lands up with tails up.

What is the probability that if you toss it now, the coin will land with heads up this time?
category : PROBABILITY

Suggestions

Mind Teasers : Prime Number < 100 Puzzle

Difficulty Popularity

Can you list all the prime numbers than 100 which when divided by 5 leaves an odd remainder?
category : MATHS

Mind Teasers : Interview Marble Logic Puzzle

Difficulty Popularity

You are given a set of scales and 12 marbles. The scales are of the old balance variety. That is, a small dish hangs from each end of a rod that is balanced in the middle. The device enables you to conclude either that the contents of the dishes weigh the same or that the dish that falls lower has heavier contents than the other.
The 12 marbles appear to be identical. In fact, 11 of them are identical, and one is of a different weight. Your task is to identify the unusual marble and discard it. You are allowed to use the scales three times if you wish, but no more.

Note that the unusual marble may be heavier or lighter than the others. You are asked to both identify it and determine whether it is heavy or light.
category : LOGIC

Mind Teasers : Riddle 1 - 1 !=3

Difficulty Popularity

Can you move four matchsticks to make the equation true?

Mind Teasers : 4 + 9 != 13

Difficulty Popularity

If the following is true, can you find the value of (4 + 9)?

7 + 7 = 2
8 + 8 = 4
8 + 5 = 1
6 + 9 = 3
10 + 11 = 9
category : LOGIC | SERIES

Mind Teasers : Oscar Winning Movie Rebus Riddle

Difficulty Popularity

Which famous Oscar movie name is hidden in the rebus below?

category : REBUS | PICTURE

Mind Teasers : Math Picture Brain Teaser

Difficulty Popularity

In the photo attached with this question, you have to place the numbers from 1 to 19 in the circles such that if we add up any side of the triangle, the sum is 17.

Mind Teasers : Frequent Maths Digit Brain Teaser

Difficulty Popularity

Can you identify the most common digit between the number 1 and 1000?
category : LOGIC | MATHS

Mind Teasers : Bridge Breaks Brain Teaser

Difficulty Popularity

There is a 30km long bridge. The bridge can only support up to a weight of 2000 kg. A car that weighs 2000 kg needs to cross that bridge. When the car has reached midway of the bridge, a bird comes and sits on top of the car. The bird weighs 300 grams.

Now, does the bridge breaks down at this point of time or not?
category : LOGIC

Mind Teasers : Pizza Cost Math Brain Teaser

Difficulty Popularity

Jasmine, Thibault, and Noah were having a night out and decided to order a pizza for $10. It turned out that Jasmine and Thibault were hungrier than Noah. They both ate 6 slices a piece, and Noah got to eat just 2 slices.

Now they want to do a fair split of money. The problem is that none of them have coins with them. Thus, they want to round off the cost to nearest dollar.

What will be the correct way to do it?

What if the pizza's cost was $11?
category : LOGIC | MATHS

Mind Teasers : Famous Elevator Riddle

Difficulty Popularity

Tanu lives on the 13th floor takes the elevator down to the ground floor every morning and goes to her office.

In the evening, when she comes back on a rainy day , or if there are other people around in the elevator, she goes to her 13th floor directly. Otherwise, she goes to the 1oth floor and walks up three flights of stairs to his apartment.

Whats the reason for her unusual behavior ?
category : LOGIC | MYSTERY

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