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
