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#### Petrus

##### Well-known member

- Feb 21, 2013

- 739

I got problem with this Word problem

Determine the number of 7-digit numbers that do not have the consequence 17th For example 4713.1572 allowed 5-digit numbers but 1723,3175,0254 are not allowed.

I did a huge progress and get answer 8457 067 but its wrong. I did calculate how many possible way i can have 17xxxxx, x17xxxx and Plenty more did take me around 2 paper.. And still get wrong. Any tips?