Explanation:
✓2 × ✓2 = ✓2×2 = ✓4 = 2
✓5 × ✓7 = ✓5×7 = ✓35
✓2 × ✓18 = ✓2×18 = ✓36 = 6
✓2 × ✓6 = ✓2×6 = ✓12 = ✓4 ×✓3 = 2✓3
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