Find : (3/7)⁻⁶ × (7/3)⁻⁵
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(3/7)^-6×(7/3)^-5
= (7/3)^6×(3/7)^5
= (7×7×7×7×7×7/3×3×3×3×3×3)×(7×7×7×7×7/3×3×3×3×3)
= 7/3
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