Answers

2014-09-29T13:26:36+05:30
-11mn+5mn-2mn-13mn
=mn(-11+5-2-13) (arrange like terms)
=mn(-6-2-13)
=mn*(-21)
=-21mn
Ans:-21mn

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2014-09-29T13:28:00+05:30
Solution

= - 11mn+5mn-2mn-13mn
=  -6mn-2mn-13mn
= -8mn-13mn
= -21mn

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