• Views : 70k+
  • Sol Viewed : 20k+

#1 - Famous Probability Interview Problem

Difficulty Popularity

James Horner is having two coins in his hand. Out of the two coins, one is a real coin and the second one is a faulty one with Tales on both sides. He blind folds himself choose a random coin and tosses it in the air. The coin falls down with Tale facing upwards.

What is the probability that this is the faulty coin?

  • Views : 50k+
  • Sol Viewed : 20k+

#2 - Logic Coins Puzzle

Difficulty Popularity

Assuming i have an infinite supply of coins.

What is the fewest number of coins would be required in order to make sure each and every coin touched exactly three other coins.

  • Views : 50k+
  • Sol Viewed : 20k+

#3 - Fake Coin Brain Teaser

Difficulty Popularity

In front of you, there are 9 coins. They all look absolutely identical, but one of the coins is fake. However, you know that the fake coin is lighter than the rest, and in front of you is a balance scale. What is the least number of weightings you can use to find the counterfeit coin?

  • Views : 40k+
  • Sol Viewed : 10k+

#4 - Math Head Tails Coin Puzzle

Difficulty Popularity

Christopher and Jonathan were having bets. They decide that a coin will be flipped twenty times and each time it turns heads, Christopher will give $2 to Jonathan and each time it turns out to be Tale, Jonathan will give 3$ to Christopher. After flipping for twenty times none of the both won or lost any amount.

How many times did the coin landed on Heads ?

  • Views : 20k+
  • Sol Viewed : 10k+

#5 - Easy Piggy Bank Math Puzzle

Difficulty Popularity

Dinki breaks its piggy bank and found 71 rupees in form of 20-paisa and 25-paisa.
There was total of 324 coins in his piggy bank.

Can you tell me how many number of 20-paisa and 25-paisa he got ?

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