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प्रश्न
672 – 372 = (67 – 37) × ______ = ______.
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उत्तर
672 – 372 = (67 – 37) × 67 + 37 = 3120.
Explanation:
We have,
672 – 372 = (67 – 37) × (67 + 37) ...[∵ a2 – b2 = (a – b)(a + b)]
= 30 × 104
= 3120
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