hannasavan8475 hannasavan8475
  • 03-01-2020
  • Mathematics
contestada

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

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sqdancefan
sqdancefan sqdancefan
  • 03-01-2020

Answer:

  8

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

Answer Link
Аноним Аноним
  • 13-02-2021

Answer:

8

Step-by-step explanation:

The first digit has two possibilities; it can either be a 2 or a 5.  

The second digit has two possibilities; it can either be a 2 or a 5.

The third digit has two possibilities; it can either be a 2 or a 5.

2 x 2 x 2 = 8 integers.

(Here are the numbers listed out):

222

225

252

255

522

525

552

555

Answer Link

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