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प्रश्न
Factorise by the grouping method : ab - 2b + a2 - 2a
योग
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उत्तर
ab - 2b + a2 - 2a = b( a - 2 ) + a( a - 2 )
= ( a + b )( a - 2 )
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Factorisation by Grouping
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