Multiple choice

The output Y in the circuit below is always '1' when

  1. two or more of the inputs P,Q,R are '0'

  2. two or more of the inputs P,Q,R are '1'

  3. any odd number of the inputs P,Q,R is '0'

  4. any odd number of the inputs P,Q,R is '1'

Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation