The reciprocal of a number is 1 divided by the number. Thus the reciprocal of 3 is 1/3; of 3/2 is 1 ÷ (3/2)= 2/3, of a/b is b/a. If a number a is the reciprocal of the number b, then b is the reciprocal of a. The product of a number and its reciprocal is 1. Thus, 3 × 1/3 = 1, (3/2) × (2/3) = 1, and (a/b) × (b/a) = 1.
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