Many of us are confused why 0! =1. This is the best explanation that I have came across.
If you have 3 playing cards in your hand, you can arrange them in 3! different ways. In other words you can put them in 3 x 2 x 1 = 6 different orders.
If you have 2 cards, you can put them in 2! different ways which is 2.
If you just have 1 card you can only arrange it 1! ways which is 1.
But if you have ZERO cards then there's also one way of doing that!
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1 comments:
erm...i thought you wouldn't have any ways to arrange ZERO cards? There aren't any cards to arrange!
It's so confusing...have you any other explanation(s)?
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