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प्रश्न
Factorise : (a+ 2b) (3a + b) - (a+ b) (a+ 2b) +(a+ 2b)2
उत्तर
(a+ 2b) (3a + b) - (a+ b) (a+ 2b) +(a+ 2b)2
= (a + 2b) (3a + b - a - b + a + 2b)
= (a + 2b) (3a + 2b)
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