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January 31, 2015

January 31, 2015

Posted by **steve** on Tuesday, May 24, 2011 at 9:39pm.

A. 10

B. 60

C. 64

D. 120

- math -
**MathMate**, Tuesday, May 24, 2011 at 9:59pmIf it has to be greater than 700000, the first digit must be 7. That leaves us with 5 digits 2,2,2,4,4 to make the remainder of the number.

Here we have 5 digits of which 2 and 3 are identical, so the number of ways to choose the 5 digits is

C(5,3,2) = 5!/(3!2!)

I'll let you do the rest.

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