We have two inputs A, B. Connect one of Mux's input to logic '1' and second to input 'B'. Connect input 'A' to selection line of Mux. So, output will give ORing operation of two inputs A, B.
So, Multiplexer will act as OR gate.
A
|
B
|
A+B
|
0
|
0
|
0
|
0
|
1
|
1
|
1
|
0
|
1
|
1
|
1
|
1
|
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