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Q.

The reciprocal of −7 9   is:


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a

9 7  

b

−9 7  

c

7 9  

d

None of these 

answer is B.

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Detailed Solution

Given a rational number −7 9  .
Replacing the numerator and denominator with each other,
The reciprocal is 9 −7  .
Multiplying numerator and denominator by -1,
= (9)×(−1) (−7)×(−1) = −9 7   The reciprocal is −9 7  .
Hence, option 2 is correct.
 
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The reciprocal of −7 9   is: