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Q.

Find the reciprocal of 20 51 × 4 91 .


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a

4643 80

b

4641 80

c

4641 81

d

4645 79  

answer is B.

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Detailed Solution

We are given an expression as follows,
20 51 × 4 91
So, first we will find the product:
20 51 × 4 91 = 20×4 51×91 = 80 4641
Now, we will take its reciprocal by interchanging the numerator and the denominator, which is 4641 80 .
Hence, the correct option is (2).
 
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Find the reciprocal of 20 51 × 4 91 .