[FONT=Arial, Helvetica, sans-serif]21[/FONT]
[FONT=Arial, Helvetica, sans-serif]= 3 x 7[/FONT]
[FONT=Arial, Helvetica, sans-serif]= 1 + 2 + 3 + 4 + 5 + 6 [/FONT]
[FONT=Arial, Helvetica, sans-serif]
A triangular number.[/FONT]
[FONT=Arial, Helvetica, sans-serif]1, 1, 2, 3, 5, 8, 13, 21...[/FONT]
[FONT=Arial, Helvetica, sans-serif]
A Fibonacci number.[/FONT]
[FONT=Arial, Helvetica, sans-serif]The total number of spots on a normal die.[/FONT]
[FONT=Arial, Helvetica, sans-serif]Formerly the legal coming-of-age when you received the `key of the door'.[/FONT]
[FONT=Arial, Helvetica, sans-serif]A game of table tennis is won by the first player reaching 21 points.[/FONT]
[FONT=Arial, Helvetica, sans-serif]We live in the twenty-first century. [/FONT]
[FONT=Arial, Helvetica, sans-serif]A
twenty-one gun salute is fired in the UK for royalty and in the US for the President. It comes from the time when the largest ships of the British navy had 21 guns along one side. [/FONT]
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Twenty-one is a card game which is also known as
Pontoon or
Vingt-et-un. Its object is to have a total score in one's hand nearest to, but not exceeding, 21.[/FONT]