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प्रश्न
Evaluate: 852 – 842
योग
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उत्तर
852 – 842
Using property, for any natural number n,
(n + 1)2 – n2 = (n + 1) + n
⇒ (84 + 1)2 – 842 = (84 + 1) + 84
⇒ 852 – 842 = 85 + 84
⇒ 852 – 842 = 169
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