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Question

The given rational numbers are 12,45,78. If these numbers are arranged in the ascending order or descending order, then the middle number is


A
12
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B
78
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C
45
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D
None
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Solution

The correct option is C (45)
Let given numbers arranged in the descending order.
Since positive value is always greater than the negative value.
So, 12 would be the first element in the arrangement.
Now consider , the negative fractions 45 and 78
Before we compare them, lets make their denominators equal as
45×88=3240 and 78×55=3540
Since 32>35
Dividing 40 on both sides of inequality
3240>3540
45>78
The descending order is 12>45>78

Also, the ascending order is 78<45<12
So, middle number is 45.


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