6m/13 * 2/mn = 3/13n
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MN^5/p^4
20m/mn = 4/n
When, in algebra, two letters are written next to each other as a term, such as m and n becoming mn, it means they are multiplied. So mn is a shorter way of writing "m times n" or "m x n"Therefore, when m = 1 and n = 1, mn = 1 x 1 = 1
MN is not an abbreviation for millions.
1 m or 1M, and less commonly, 1 mn or 1 Mn.