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[If P then Q] does not equal to [If (not P) then (not Q)].

That's called the "mistaken negation".

vanquisher
isnt statement A and B are logically same?
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from where i can learn these type of concepts
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[If P then Q] does not equal to [If (not P) then (not Q)].

That's called the "mistaken negation".


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In the GMAT Official Guide, either the Main OG or the Verbal Review Guide, there is a Verbal Review chapter. They cover basic concepts of conditional reasoning.

If you'd like a deeper coverage, PowerScore GMAT CR Bible (or the LSAT LR Bible) has a good chapter on conditional reasoning.

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from where i can learn these type of concepts

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Hi vanquisher,

Great question, and it's a classic CR trap. A and B look identical, but they're actually mirror images that say different things. Let me line them up in plain "if-then" form.

Write both as conditionals:

- (A): unaffected by the need for profit → has absolute integrity.
- (B): affected by the need for profit → does not have absolute integrity.

Notice that (B) is not a restatement of (A) - it flips both halves. In logic these are inverses of each other, and an inverse is not logically equivalent to the original. Knowing what makes something have integrity (A) does not tell you what makes something lack it.

Why this matters for the argument: the premise tells us profit did affect the decisions in most independent films. To reach the conclusion "they lack absolute integrity," you need a rule that starts from affected and lands on no integrity. That's exactly (B). Choice (A) starts from unaffected, so it never fires here - trying to use it would be denying the antecedent.

A quick everyday version to feel the gap:

- Statement A-style: "If you don't eat junk food, you're healthy."
- Statement B-style: "If you do eat junk food, you're not healthy."

These clearly aren't the same claim. The A-version tells you nothing about a junk-food eater - they might be unhealthy, might not. Only the B-version lets you conclude "this junk-food eater is unhealthy."

Since our premise is the "did eat junk food" case (profit did affect the films), only (B) delivers the conclusion.

Answer: B
vanquisher
isnt statement A and B are logically same?
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