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Which of the following sets are equal ? ...

Which of the following sets are equal ?
`A={x:x inN,xlt4},B=(1,1,2,3,3},C={1,3},D={x:x` is an odd natural number `lt5} E={1,2,3},F={1,1,3}`

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The correct Answer is:
`{:(A=B=E,),(C=F=D,):}`
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