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Question

Find the rational number which is represented by the following decimal numbers : 2.00¯¯¯¯¯¯12

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Solution

Let r=2.00¯¯¯¯¯¯12, then 100r and 10000r will be as follows:

100r=100×2.00¯¯¯¯¯¯12=200.1212

1000r=1000×2.00¯¯¯¯¯¯12=20012.1212

Now consider 10000r100r as shown below:

1000r100r=20012.1212200.1212=19812.009900r=19812r=198129900r=1651825

Hence, the required rational number is 1651825.

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