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11x13=(12-1)×(12+1)=?

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11x13=(12-1)×(12+1)=?

Posted by सुरेश सुरेश गौर 5 years, 6 months ago

CBSE > Class 07 > Mathematics

2 answers

Shree Dhar Mishra 5 years, 6 months ago

11 X 13=(12-1) X (12+1) =11X13=11X13 =12²-1² =143

Yogita Ingle 5 years, 6 months ago

11 x 13

= (12-1)×(12+1) [ ∵ a² - b² = (a-b)(a+b)]

= 12² - 1²

= 144 - 1

= 143

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