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प्रश्न
Evaluate, using (a + b)(a - b)= a2 - b2.
999 x 1001
बेरीज
उत्तर
999 x 1001
= (1000 - 1) x (1000 + 1)
= (1000)2 - (1)2
= 1000000 - 1
= 999999.
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