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A student does the following examples:

$-4\cdot9=-36$$-9\cdot4=-36$$-10\cdot2=-20$$10\cdot-2=-20$

What rule is the student most likely trying to find out?

How to find the sign for the sum of numbers with different signs

How to find the sign for the product of numbers with the same sign

How to find the sign for the product of numbers with different signs

How to find the sign for the sum of numbers with the same signs