How many positive integers
n
can be formed using the digits 3, 4, 4, 5, 5, 6, 7 if
n
has to
exceed 5000000?
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Answer:
=180. The total of numbers n > 5, 000, 000 is equal to the number of arrangements of 3, 3, 4, 5, 6, 7 of size 6; thus, 6!
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