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April 20, 2014

April 20, 2014

Posted by **MATH Help** on Monday, January 30, 2012 at 6:16pm.

- math -
**Reiny**, Monday, January 30, 2012 at 6:35pmThere are 900 of those counting numbers with no restriction.

Let's find all those that DON'T have a 2 in them

there are 8 possible in the left spot , (no 2 or 0)

but 9 anywhere else

number of counting numbers with NO 2 in them is

8x9x9 = 648

So 900 - 648 or 252 of them have at least one 2 in them.

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