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How many numbers are there between 500 and \(600\) in which \(9\) occurs only once?

 Feb 11, 2022
 #1
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Well, why don't you just list the numbers with one "9" in them?

 

509, 519, 529, 539, 549, 559, 569, 579, 589, 590, 591, 592, 593, 594, 595, 596, 597, 598 ==18 such numbers.

 Feb 11, 2022

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