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Question

A sum of money is rounded off to the nearest rupee. The probability that the round off error is at most 10 paise is

A
1/10
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B
11/100
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C
3/25
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D
None of these
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Solution

The correct option is D None of these
Sample Space is {0.50,0.49,...,0,0.01,...,0.49}.
n(S)=100
and the sound off error is at most 10 paise if
A={0.10,0.09,...,0.10}
n(A)=20
Therefore, Required probability is 20100.

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