Four test vector are required. To test 'struck at 0' fault 111 is the input test vector and to test 'struck at 1' fault 110 , 101 ,011 are the input test vectors.
Since Y=C'BA'+CB'A+CBA on simplification yields Y=C'BA' + CANow it depends on the multiplexer we are using. If 8:1 MUX is used then just use A, B, C as select lines and the output of the truth table a...
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