Mental Floss 319

The answer to last week’s challenge is: Q: If seven people meet each other and each shakes hands only once with each of the others, how many handshakes will there have been?

A: 21 handshakes.

This week’s thinking challenge is …

Q: At noon and at midnight, the hands on a clock are in exactly the same place. How many other times between noon and midnight do the hour and the minute hands cross?

The answer along with a new challenge, next week.

Have an excellent weekend!

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