Why are tennis scores 15, 30, 40...

A tennis score board - Ever wondered why the tennis scores in a game goes 15, 30, 40
@pitstop (4757)
India
June 25, 2007 8:21pm CST
Ever wondered why the tennis scores in a game goes 15, 30, 40. I've always wondered why!! Why cant it be 1, 2, 3 like normal games. It doesnt make mathematical sense to me at all!! Any bright ideas as to why this strange progression of scores and the history behind it!
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