Can you tell me how Factorial Zero is one?

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Let us see an example. How many handshakes are possible with 'n' people? nC2= n!/ Now how many handshakes are possible with n=2. Only one. that means 1= 2!/ therefore 0!=1.
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Let us see an example. How many handshakes are possible with 'n' people? nC2= n!/ Now how many handshakes are possible with n=2. Only one. that means 1= 2!/ therefore 0!=1.
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Let us see an example. How many handshakes are possible with 'n' people? nC2= n!/ Now how many handshakes are possible with n=2. Only one. that means 1= 2!/ therefore 0!=1.
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