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The digits $1,2,3,4$ and $5$ can be arranged to form many different $5$-digit positive integers with five distinct digits. In how many such integers is the digit $1$ to the left of the digit $2$? (The digits 1 and 2 do not have to be next to each other.)

 Jul 20, 2021
edited by Guest  Jul 20, 2021
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There are 72 ways of arranging the five digits.

 Sep 4, 2021

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