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Mathematics, 05.11.2019 20:31 jackieericksonpdub87

How many 5-digit sequences can we form from the integers 1, 2, 9 if:
a) the digits can be the same.
b) the digits cannot be the same and the order in which they appear matters.
c) the digits cannot be the same and the order in which they appear does not matter

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How many 5-digit sequences can we form from the integers 1, 2, 9 if:
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