Children Probability

John and Jenni are a married couple. They have two kids, one of them is a girl. Assume safely that the probability of each gender is 1/2.
What is the probability that the other kid is also a girl?

Hint: It is not 1/2 as you would first think.




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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?

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Do You See It?

Do You See It?

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There are a number of books on a shelf. If one book is the 4th from the left and 6th from the right, how many books are on the shelf?

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There's a day, that comes around once a year.
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In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

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Jigsaw puzzles

Jigsaw puzzles soared in popularity during the great depression, as they provided a cheap, long-lasting, recyclable form of entertainment.