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Without repeats there are 4 × 3 = 12 possible 2 digit numbers. With repeats there are 4 × 4 = 16 possible 2 digit numbers.
All of them. There are roughly 45,000 5-digit odd numbers. None of them end in 0.
Assuming whole numbers and a leading zero does not count: 10,234,567
Highest 2-digit number = 99 Highest 1-digit number = 9 Highest possible sum from 2, 2-digit numbers = 198 Highest possible sum from 2, 1-digit numbers = 18
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