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The meaning of the first sentence is that you don't like the two colours together. The intended meaning is that you don't like either of them, even separately.
If we join clauses with different subjects, we use and even after a negative: He didn't write to me and I was worried.
Where or not is implied, use whether, not if. Unlike whether, if does not expect a Yes or No reply: I shall speak to him if he comes.
Avoid using the phrase as I think instead of I think. Say: He's lazy and I think he'll fail, not as I think.