Factorise 21^2mn-31m^2n+41mn^2
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question is not clear
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the question is not clear - however, if it is as :
21² m n - 31 m² n + 41 m n²
= m n ( 21² - 31 m + 41 n)
21² m n - 31 m² n + 41 m n²
= m n ( 21² - 31 m + 41 n)
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