Which matrix multiplication is possible?

When calculating A×B, the number of columns of A = number of rows of B.

Thus, only last case is possible.

160

step-by-step explanation:

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it will cost dollar $540

the living room is 3 which means if we divide 325/3 then we get $108

therefore if 1part of the living room cost $108 and 3 costed $325

then total 5part of the room will cost 5*108 which gives $540