Maths for YOU!

True statement: Weird is normal
False statement: Sarah is weird
Not a statement: Sarah is normal

P: Sarah is weird.
Q: Weird is normal.
Conclusion: Sarah is normal.

Sarah is normal and sarah is weird. according to the above, sarah is normal is not a statement and sarah is weird is a false statement. Therefore, the statement is false.

Weird is normal or Sarah is weird. according to the above, weird is normal is a true statement whereas sarah is weird is a false statement. Therefore, the statement is true.

Sarah is normal, IF AND ONLY IF normal is weird.

Set Sarah : {weird, normal}

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