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If a=0, then A=0 and b=1 and B=1 (and a=0 because S=1.)
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Again, as long as S=1 and R=1, the state of the circuit will not change:
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R-S latch stores the value 0 , which corresponds to the value of output a=0.
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If we set S=0 while R=1, the latch will be set to 1.
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If we set R=0 while S=1, the latch will be set to 0.
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R-S latch circuit:
