1.

ab−mn+an−bm=?(a) (a−b)(m−n)(b) (a−m)(b+n)(c) (a−n)(m+b)(d) (m−a)(n−b)

Answer»

abmn+anbm=?(a) (ab)(mn)(b) (am)(b+n)(c) (an)(m+b)(d) (ma)(nb)



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