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'All students in my class are bright. Mehtab is not bright.' What follows?

ASome students are not bright
BMehtab is not a student of my class ✓ Correct
CMehtab must change his school
DNo student is dull
Correct answer: (B) Mehtab is not a student of my class
Explanation

It follows that Mehtab is not a student of my class.

The rule is that all students in my class are bright.

Mehtab is stated to be not bright.

Whatever lacks the property 'bright' cannot fall in a class where all are bright.

By denying the consequent, Mehtab is placed outside that class.

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