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Question

If Rn={x:−1n<x<1n} then R5∪R15= ________

A
R5
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B
R15
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C
R3
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D
R20
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Solution

The correct option is A R5
R5= { x:15<x<15 }
And
R15= {x:115<x<115 }
But, 115<x<115 is within the limits of 15<x<15
Hence, R5R15=15<x<15=R5

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