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प्रश्न
Evaluate, using (a + b)(a - b)= a2 - b2.
15.9 x 16.1
योग
उत्तर
15.9 x 16.1
= (16 - 0.1) x (16 + 0.1)
= (16)2 - (0.1)2
= 256 - 0.01
= 255.99.
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