The answer is 20C4 = 20*19*18*17/(4*3*2*1) = 4845
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There are many answers. Here is one: 58 and 20
Including the one in ' 1 ' and the one in '100', there are 21 1s.Every other digit 2 - 9 appears 20 times between 1 and 100 .
Ah, a 20-digit number is called a "vigintillion." Isn't that just a lovely word to say? It's like a cozy little cabin in the woods, nestled among the trees. Just imagine all the happy little numbers dancing around in that big, long vigintillion!