Can you count it?

Number Theory Level 2

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


The answer is 18.

Soumya Shrivastva by Soumya Shrivastva , 20, India

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1 solution

Soumya Shrivastva
Jan 16, 2016

R e q u i r e d n u m b e r s a r e 509 , 519 , 529 , 539 , 549 , 559 , 569 , 579 , 589 , 590 , 591 , 592 , . . . . . . . . . . . . . . . . . . , 1598 S o , t h e r e a r e 18 s u c h n u m b e r s . Required\quad numbers\quad are\quad 509,\quad 519,\quad 529,\quad 539,\quad 549,\quad 559,\quad 569,\quad 579,\quad 589,\quad 590,\quad 591,\\ 592,..................,\quad 1598\\ So,\quad there\quad are\quad 18\quad such\quad numbers.

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