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If , what is the value of ?
Question

If , what is the value of ?

A.

10404

B.

10402

C.

10406

D.

10400

Correct option is B

Given:  
x1x=10x-\frac{1}{x} =10 
To find: x4+1x4x^4+\frac{1}{x^4}    
Formula Used: 
(ab)2=a2+b22ab(a-b)^2 = a^2 +b^2 -2ab ​​
Solution: 

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