Hardest brain teasers

Hi all,

Wanted to gauge the community on what are some of the hardest brain teasers they've been asked in interviews.

If anyone has gotten any tough ones from banks on the east coast, would love to grab those here too.

Cheers

 

I don't think the above brain teasers are that hard, as it does not have a definite correct answer and any solution that you come up with may be as good as the next one.

What makes this number unique -- 8,549,176,320?

I don't know... Yeah. Almost definitely yes.
 

Two people are playing a game:

  • The first person to roll a 4 on a standard dice wins the game
  • If player 1 (who goes first) rolls a 4 on his first roll then the game is over instantly
  • If not, player 2 rolls. If player 2 gets a 4 the game is over. If player 2 doesn't roll a 4 the game continues until someone does

Q1 - Does player 1 have an advantage by going first? Q2 - What are the exact odds of player 1 winning the game?

Hint: Answer q2 with a fraction, making a grid of outcomes can help with this brainteaser

 

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