Question
If 67 × 67 = 4489, without multiplication find 67 × 68.
✓
Answer
Since, 67 × 67 = 4489
∴ 67 × 68
= 67 × 67 + 67
= 4489 + 67 = 4556
∴ 67 × 68
= 67 × 67 + 67
= 4489 + 67 = 4556
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