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Question
Factorize each of the following expressions:
qr − pr + qs − ps
Solution
\[qr - pr + qs - ps \]
\[ = (qr - pr) + (qs - ps) [\text{ Grouping the expressions }]\]
\[ = r(q - p) + s(q - p)\]
\[ = (r + s)(q - p) [\text{ Taking }(q - p) \text{ as the common factor }]\]
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