SOLUTION: how many 2 digit numbers can be formed from 1, 2, 3, 4 such that each number contains one

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Question 1088455: how many 2 digit numbers can be formed from 1, 2, 3, 4 such that each number contains one
Answer by ikleyn(52777) About Me  (Show Source):
You can put this solution on YOUR website!
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3 + 3 + 1 = 7.