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need help in tis problem

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which biconditional is not a good definition?

1. a whole number is odd if and only the number is not divisible by 2
2. an angle is straight if and only if its measure is 180
3. a whole number is even if and only if it is divisible by 2
4. a ray is a bisector of an angle if and only if it splits the angle into two angles

  • need help in tis problem -

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