hard · GMAT Quant

Which of the following describes the 'Negation Technique' as used in Critical Reasoning for Assumption items?

1. If the logical opposite of an answer choice causes the argument to collapse, that choice is a necessary assumption.
2. Negating the conclusion of the argument allows you to identify which premises are redundant in this system.
3. The technique proves that an argument is flawed by showing its premises are contradictory in this system.
4. It involves reversing the causal direction of the stimulus to find a third variable in this system in this system.
5. By negating every fact in the stimulus, the solver can identify the author's hidden bias in this system in this system.

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