This question is asking what cannot be the complete combination of colors.
The only way to solve this question is by finding a rule violation. The rule violation has to be within a single window, because that’s all the answers show.
Only rules three and four can lead to rule violations within a single window. Here are the two possible violations:
- Yellow with either orange or green (rule 3).
- A window without orange or purple (rule 4).
None of the answers violate rule 3. C violates rule 4. C is CORRECT.
Many people choose D. If you did this, you need to review the rule about purple and orange. Here was the form:
A ➞ B
B ➞ A
This form means that you need at least one of A or B. But you could have both! You can only read diagrams left to right. The diagrams don’t say that if you have A you can’t have B.
I’ll give an example with parents. Suppose I say “if you’re a parent, you have a boy or a girl”. Here’s that rule in the same format:
boy ➞ girl
girl ➞ boy
If you have no boy, you have a girl. But everyone know parents can have both boys and girls.
So remember: if the sufficient condition is negated and the necessary is normal, it means “you need at least one and could have both”.
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