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I am getting b) but right option is a) please check it

There is no free lunch can be rewritten as "It is false that there is at least 1 free lunch".So a is true.

Statement b is the negation of the statement "Every lunch is free".In this negation, there can be some lunch which is not free.But the given statement is "There is no free lunch"

amitqy shouldn'nt this line- there can be some lunch which is not free

is - (x)(Lunch(x)$\wedge$$\sim$Free(x))

I understand it as : There exists at least one lunch and it is not free.

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