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Q.

Write the decimal expansion of  number 25 1600  .


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a

     0.06421875 

b

     0.05421875

c

     0.015625

d

     0.0421875 

answer is C.

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Detailed Solution

Given,
The rational number is 25 1600  .
As we know,
Rational number is number that can be expressed as p q   of two integers and q  is non zero.
Simplifying the number 25 1600  , we get,
25 1600 = 25 2 4 × 10 2   25 1600 = 25× 5 4 2 4 × 5 4 × 10 2  
25 1600 = 15,625 2×5 4 × 10 2   25 1600 = 15,625 10 4+2    25 1600 = 15,625 10 6 25 1600 =0.015625  
Hence, the decimal expansion of 25 1600   is 0.015625.
Therefore, option(3)     is correct answer.
 
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