How many three-digit positive integers exist, all of whose digits are 2's and/or 5's?

Mathematics

1 answer:

vfiekz [6]3 years ago

3 0

Answer:

Step-by-step explanation:

There are two choices for each digit, and 3 digits, so 2^3 = 8 possible numbers. Here's a list:

222, 225, 252, 255

522, 525, 552, 555

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