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softbracket
The reciprocal of 15 is 1/15.
1/15 x 15 = 1 which makes it the reciprocal of 15.
You could also think of 15 as being 15/1 and the reciprocal is that fraction but with the numerator and denominator flipped.

Answer:

15/1

Step-by-step explanation:

hope this helps!