Frederik wants to make a special seven-digit password. Each digit of his password occurs exactly as many times as its digit value. The digits with equal values always occur consecutively, e.g. 4444333 or 1666666.
How many possible passwords can he make?
Select one option, then click Submit.
6
7
10
12
13
Select an option, then submit.
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Pink Kangaroo 2017 (2017)
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