Birthday Paradox (Birthday Problem)

You may solve the simple probability, “Given a set of n randomly chosen people, what is the probability of two people having same birthday?” You may also […]
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Logic Puzzle: Inverting the glasses

Four glasses are placed on the four corners of a square rotating table. Each glass is either upright (up) or upside-down (down). You have to […]
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Upstream-Downstream relative speed question

A person rides a cycle at a constant speed. When he drives in the direction of the wind, he is able to go 35 km in 5 […]
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Fastest horse Interview question

There are twenty five horses and you can conduct a race of only five horses at one time. There is no way to find out […]
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Number of Rectangles on a chess board

Earlier we discussed, how to calculate total number of squares (of all sizes) on the chess board. Here, the problem is, How many rectangles (of […]
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value of expression

What is the value of 1/2 of 2/3 of 3/4 of 4/5 of 5/6 of 6/7 of 7/8 of 8/9 of 9/10 …. of 99/100 […]
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Time and Speed puzzle

Two friends decided to get together and start riding bikes towards each other, both at a speed of 6 km/hr (starting at the same time). […]
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Effect on area of rt angled triangle if base is increased and hight reduced

If the base of a Right angled triangle is increased 4 times and height is reduced to half, what will be the effect on its […]
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