[25Pd] A 4 digit number divisible by 9

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MathBuster

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Apr 11, 2015, 5:13:38 PM4/11/15
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How many 4-digit numbers can you form using the digits 3, 6 and 9 such that:
  1. No digit is used more than 3 times; and
  2. The 4-digit number formed, is divisible by 9.

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