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प्रश्न
Evaluate: 203 × 197
उत्तर
203 × 197
= (200 + 3) (200 − 3)
= (200)2 − (3)2 ......[ ∵ (a − b) (a + b) = a2 − b2]
= 40000 − 9
= 39991
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