[UF142] The Marked Cup

Puzzle

US Version

As seen in the upper-left image below, you placed three identical paper cups on the table and secretly marked the middle one, as shown by the small blue arrow.

You then closed your eyes and told a friends, "Hide a coin under one of the cups and switch the places of the other two."

When you opened your eyes, the cups were rearranged as seen below. Which one, A, B, or C, has the coin hidden beneath it?

UK Version

You placed three identical paper cups on the table as shown in the top-left image and secretly marked the middle one as shown by the small blue arrow.

You then closed your eyes and told a friend: "Hide a coin under one of these cups and then switch the places of the other two."

When you opened your eyes, the cups were rearranged as shown below. Which one has the coin hidden under it, A, B or C?

Hints

Solution

Incorrect

Too bad!

If you pay attention to the conditions of the puzzle and the location of the marked cup, you should figure it out.

Correct

Yeah!

The coin is under cup A!

Since the marked cup in the middle moved to the right to become cup C, you know that it switched places with the cup that started there, which is now cup B.

The cup that your friend hid the coin under didn't move, so you know it must be cup A!

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