top button
Flag Notify
    Connect to us
      Site Registration

Site Registration

How will divide the pearls to increase your chances of survival?

0 votes
668 views

You are trapped into a death trap by the famous jigsaw killer. A screen flashes in front of you and explains you the trap game.

There are 100 pearls kept in a bowl in front of you and an empty bowl. Among the 100 pearls, 50 are white and 50 are black. You can divide them as you like into the two bowls. Once you are done, you will pull a lever, which will turn the room pitch black. The bowls will move and shuffle around. In the dark, you have to pick up one pearl from any bowl. Once you do that, the room will flood with lights again. If the peral you have in your hand is white, you will be allowed to live, but if the pearl you picked is black, the room will be filled with poisonous gas and you will die.

How will divide the pearls to increase your chances of survival?

posted Jul 29, 2015 by Parampreet Kaur

Share this puzzle
Facebook Share Button Twitter Share Button LinkedIn Share Button

3 Answers

+3 votes
 
Best answer

Put 1 white pearl in one bowl and remaining 49 white pearls plus 50 black pearls in other bowl.

Then probability of getting white ball from first bowl is 1/1 = 1
Probability of getting 1 white pearl from second bowl is 49/99 = 0.49

Therefore total probability of getting a white pearl from one bowl at random will be,
0.5 x 1 + 0.5 x 0.49 = 0.745

Therefore, there will be a chance of living will be 74.5%

answer Jul 29, 2015 by Md. Sadique Alam
+2 votes

Place one white pearl in a bowl and all the rest into another bowl.

Then probability of getting white ball from first bowl is 1/1 = 1
Probability of getting 1 white pearl from second bowl is 49/99 = 0.495

Probability of picking the white ball
0.5 x 1 + 0.5 x 0.49 = 0.745

answer Aug 5, 2015 by Salil Agrawal
0 votes

Answer:
Put 1 white pearl in one bowl and remaining 49 white pearls plus 50 black pearls in other bowl.
Then probability of getting white ball from first bowl is 1/1 = 1
Probability of getting 1 white pearl from second bowl is 49/99 = 0.49

Therefore total probability of getting a white pearl from one bowl at random will be,
0.5 x 1 + 0.5 x 0.49 = 0.745

Therefore, there will be a chance of living will be 74.5%

answer Sep 26, 2017 by Mogadala Ramana



Similar Puzzles
+1 vote

You are trapped into a death trap by the famous jigsaw killer. As usual, a screen flashes in front of you and explains you the trap game.

There are 100 pearls kept in a bowl in front of you and an empty bowl. Among the 100 pearls, 50 are white and 50 are black. You can divide them as you like into the two bowls. Once you are done, you will pull a lever, which will turn the room pitch black. The bowls will move and shuffle around. In the dark, you have to pick up one pearl from any bowl. Once you do that, the room will flood with lights again. If the peral you have in your hand is white, you will be allowed to live, but if the pearl you picked is black, the room will be filled with poisonous gas and you will die.

How will divide the pearls to increase your chances of survival?

+1 vote

Long ago, a young Chinese prince wanted to marry a Mandarin's daughter. The Mandarin decided to test the prince. He gave the prince two empty, porcelain vases, 100 white pearls, and 100 black pearls. "You must put all the pearls in the vases", he told the prince. "After this, I will call my daughter from the room next door. She will take a random pearl from one of the two vases. If this pearl is a black one, you are allowed to marry my daughter."What was the best way in which the prince could divide the pearls over the vases?

0 votes

You are stuck on an island where you have nothing. You find four pieces of paper somewhere on the island.

What will be your strategy to escape from the island safely?

PS: No other resource is available to you on the island, neither can you build anything.

+1 vote

Two friends were stuck in a cottage. They had nothing to do and thus they started playing cards. Suddenly the power went off and Friend 1 inverted the position of 15 cards in the normal deck of 52 cards and shuffled it. Now he asked Friend 2 to divide the cards into two piles (need not be equal) with equal number of cards facing up. The room was quite dark and Friend 2 could not see the cards. He thinks for a while and then divides the cards in two piles.

On checking, the count of cards facing up is same in both the piles. How could Friend 2 have done it ?

...