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Question

Which of the following is an empty set


A

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B

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C

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D

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Solution

The correct options are
B


D


Since x2 + 25 = 0, gives x2 = -25

⇒ x = ± 5i

∴ x is not real but x is real (given)

Similarly, for x2 = -36
x = ± 6i

∴ No value of x is possible.
So, options B and D are null sets.


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