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Wednesday, July 14, 2010

The Circus is in Town!!!

3. How many 4 digit numbers can be made from the digits 1, 2, 4, 5 and 7 if a prime number must be the first digit and 4 must be the last digit and no digit can be repeated?

Unfortunately the circus invaded my work space. my apologies.

(actually I think the answer is 18, any readers care to check that for me?)

102 Combinatorial Problems
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