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how many positive integers are there less than 800 such that all the digits are odd?

Mathematics
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hey, how's it going?
good
so let's start with 1,3,5,7,9.

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Other answers:

ok
that is a good base for us, because it's good to remember that there are 5 possibilities for the end digit
why
now what can the 2nd digit be? 1,3,5,7,9, of course
what i dont understand
so for up to 100, we have the 5 1-digit numbers, plus 5 possibilities for the tens digit, and there are 5 possibilities for the ones digit for each of those. so that's 25 more.
you understand so far? in the 10s, 11,13,15,17,19 work. that's 5. in the 30s, 31,33,35,37,39. 5. so there's a pattern. 5+5+5+5+5 = 25 numbers that have all odd digits from 10 to 99

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