How many three-digit numbers can be made from the digits 1 and 0?

To write three-digit numbers, three digits must be used, and a three-digit number cannot begin with the digit “0”. Then it turns out that using the digits “0”, “1” you can write the following numbers: 111, 110, 101, 100.
Answer: using the numbers 0 and 1, you can write four three-digit numbers.

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