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# Ten-digit numbers

A good riddle is one that really makes you think.

I have a calculator that can display ten digits.

How many different ten-digit numbers can I type using just the 0-9 keys once each, and moving from one keypress to the next using the knight’s move in chess? (In chess, the knight move in an L-shape-one square up and two across, two squares down and one across, two squares up and one across, and other like combinations.)

You can form the numbers 5034927618 and 5038167294. You can also form their reverses: 8167294305 and 4927618305. Hence four different numbers can be made.

## How can this be?

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## Always involve a bed

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## Long shaft

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## Which ball?

Two barrels contain each the same amount of water. The water temperature in one barrel is 49°F while the other is at 29°F. Two golf balls of same dimension and weight are dropped simultaneously into the barrels. The golf balls are dropped from the same height.Which...