Which arithmetic operation is valid for quantities of two different dimensions?

If two quantities, A and B, have different dimensions. Which of the following arithmetic operations could be physically meaningful. (a) A + B (b) B - A (c) A + B (d) A/B (e) AB
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You can only multiply and divide two quantities of different dimensions, for example; Speed = Distance / Time; Distance is in meters while time is in Seconds, the answers is in meters/sec.
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the princess
option d and e, multiplication and division.
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