# Counters – 31

31. A 4-bit ripple counter consists of flip-flops, which each have a propagation delay from clock to Q output of 15 ns. For the counter to recycle from 1111 to 0000, it takes a total of ________.

(a) 15 ns
(b) 30 ns
(c) 45 ns
(d) 60 ns

Explanation
Explanation : No answer description available for this question. Let us discuss.
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