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प्रश्न
factorise : m - 1 - (m-1)2 + am - a
उत्तर
m - 1 - (m-1)2 + am - a
= (m - 1) - (m - 1)2 + a (m - 1)
= (m - 1) (1 - (m - 1) + a)
= (m - 1) (1 - m + 1 + a)
= (m - 1) (2 - m + a)
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