Today is 10 day of the year.

10 = 2 x 5

10 is one of only 5 numbers that are both a triangular and a tetrahedral number.

10 = 2 + 3 + 5 i.e. it is the sum of the first three prime numbers.

10 is a happy number.

There are 10 ways to choose 3 objects from 5 objects where order is not important.

Let the five objects be the letters A, B, C, D and E.

The 10 combinations of these letters are

A, B, C

A, B, D

A, B, E

A, C, D

A. C. E

A, D, E

B, C, D

B, C, E

B, D, E

C, D, E

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