Question

Using the digits 0-9, determine how many 8-digit numbers can be constructed according to the following criteria: The number must be odd and at least 60,000,000; digits may be repeated

Answer 1

So the number of 8-digit numbers at least 60,000,000 should just be \(99999999-60000000+1=40000000\). How many of these do you think are even? how many odd?

Answer 2

Still confused. The answer would be 20000000

Answer 3

half of those \(40000000\) numbers left are even, and half are odd, so we count \(20000000\) such numbers

Answer 4

okay thank you