Choose the coorect altertnative answer f...

Choose the coorect altertnative answer for each of the following question:
Which of the following is a singleton set?

A

`P={x|x^2 = 49, x in I }`

B

`Q = {y|y^2 + 5 = 2y^2 + 4, y in I}`

C

`R= {m|m in I, mn^3 = 27}`

D

`S={n|n^2 -25 =0}`

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The correct Answer is:

C

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