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प्रश्न
Factorise.
z − 7 + 7xy − xyz
बेरीज
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उत्तर
The given expression is z − 7 + 7xy − xyz
= z − x × y × z − 7 + 7 × x × y
= z (1 − xy) − 7 (1 − xy)
= (1 − xy) (z − 7)
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