Product rule (m⋅nm\cdot n)
If the first choice can be made in mm ways and independently the second in nn ways, then an ordered pair “first the first, then the second” occurs in m⋅nm\cdot n ways. Typical markers: “for each … there exists …”, “both … and …”, “a chain of steps”.
Use the product when m,nm,n refer to successive steps of one composite choice
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