Question

Which of the following is not a singleton set ?
1) { x: bx = 5, xeN}
3) { x: x2 + 2x + 1 = 0, x€N}
2) { x: brl = 6, X e Z}
4) { x:x2 = 7, x€N}​

Answer 1

Answer:

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Step-by-step explanation:

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