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प्रश्न
Evaluate, using (a + b)(a - b)= a2 - b2.
399 x 401
बेरीज
उत्तर
399 x 401
= (400 - 1) x (400 + 1)
= (400)2 - (1)2
= 160000 - 1
= 159999.
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