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What is the time complexity for checking whether an assignment of truth values
to variables x1 … xn satisfies a given formula f(x1,…,xn)?

(A) O(2^n)
(B) O(g(n)) where g is a polynomial
(c) O(log(n))
(D) None of the above

If i'd have to check whether assigning a true value to each of $x_1,x_2,....x_n$ satisfies the formula or not can be done in polynomial time. i.e option B.
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The question is a bit unclear so I interpreted it as :

To check whether there exists an assignment such that the formula is true, this requires computing all possible assignments , there are $2^n$ of them. It'd be $O(2^n)$.
On the other hand if i'd have to check whether assigning a true value to each of $x_1,x_2,....x_n$ satisfies the formula or not can be done in polynomial time. i.e option $B$
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Look at my next comment, i hope it'd be clear now. Let me modify the answer as well.
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to check whether assigning a true value to each ---why you are considering by own.In question  it is not mention right ?
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Yes that was my mistake. I've edited now.

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+1 vote
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