They will always contrast. Whether or not they will repel depends on the context. In electromagnetism they do not repel. In people, they might.
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Two like charges will repel each and will be attracted to the opposite charges.
Negative * positive = negative Positive * positive = positive Negative * negative = positive
Like charges repel
Negative * positive = negative Positive * positive = positive Negative * negative = positive
A negative divided by a positive is negative. A negative divided by a negative is positive. A positive divided by a positive is positive. A positive divided by a negative is negative.