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3 years ago

List all of the two digit numbers that can be made using the digits 5,7,and 8

Mathematics

1 answer:

LuckyWell [14K]3 years ago

3 0

9514 1404 393

Answer:

57, 58, 75, 78, 85, 87 (no repeats)

add 55, 77, 88 to the above list if repeats are allowed.

Step-by-step explanation:

With no repeating digits, there are 3 ways to choose the first digit, and 2 ways to choose the second digit, for a total of 3×2 = 6 possible numbers

57, 58, 75, 78, 85, 87

If the digits can be repeated, than you can add 55, 77, 88 to that list:

55, 57, 58, 75, 77, 78, 85, 87, 88

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