I am aware that there are 468559 numbers less than 1,000,000 with 2 as digit as shown here, so I assume that means there are also 468559 numbers less than 1,000,000 with 4 as a digit. However, how do you find how many positive integers less than 1,000,000 that have either 2 or 4 as a digit, but not both?
2026-03-30 01:30:03.1774834203
How many positive integers less than a million have either a 2 or a 4 (but not both) in its digits?
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First count the how many numbers there are without any
4.Then subtract how many there are without any
2or4.You have now how many numbers there are with at least one
2and no4.The same computation will show how many there are with at least one
4and no2.