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il63 [147K]
3 years ago
5

How many 3-digit numbers can you write using only the digits 1 and 2?

Mathematics
1 answer:
defon3 years ago
4 0
For the first digit, you have two possible choices: 1 or 2. For *each* of those choices, you can choose 1 or 2 for the second digit in the number, and for each of *those*, you can choose 1 or 2 for the third digit of the number.

That’s 2 * 2 * 2 or 8 possible 3-digit numbers you can make with the digits 1 and 2.
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