Eleven digit numbers are those in the range between
9,999,999,999 and 100,000,000,000 exclusive.
There are 90,000,000,000 of these.
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You can select 12 numbers for the first digit, 11 numbers for the second digit, and 10 numbers for the third digit; so 12*11*10 = 1320 sets of 3 numbers can be made out of 12 different numbers.
11 (eleven)
342 of them.
If 11 and 111 is counted as 1 digit, the answer is 119.If 11 is counted as 2 digit 1's, the answer is 131.
There is no THE two-digit natural number because there are many of them. 10, 11, 12, .. 99 are all 2-digit natural numbers.