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⟩ How many 21 multiplexers do we need to make a 2 input XOR gate?

A xor B= A'B + AB'

hence, if A=0, then the output is B

if A=1, then the output is B'

so we need only ONE mux (2:1), which is controlled by A, and its inputs are B --> mux_in_0

B' --> mux_in_1

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