mecca99 mecca99

01-05-2016
Mathematics

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If j, k, and n are consecutive integers such that 0 < j < k < n and the units (ones) digits of the product jn is 9, what is the units digits of k?

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01-05-2016

All of those numbers have nothing but ones digits, that is, they're all single digits. j=4, k=5, and n=6.

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