Asked by s17
How many positive integers less than 1000 are there which contain at least one 4 or at least one 9 (or both)?
Answers
Answered by
Steve
well, all the 400's and all the 900's
and all the 40's & 90's of the other 8 hundreds
and all the other 8 numbers ending in 9 for the other 8 hundreds
and all the 40's & 90's of the other 8 hundreds
and all the other 8 numbers ending in 9 for the other 8 hundreds
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