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An asynchronous binary up counter, made from a series of leading edge-triggered flip-flops, can be changed to a down counter by ________.

taking the output on the other side of the flip-flops ( instead of Q)
clocking of each succeeding flip-flop from the other side ( instead of Q)
changing the flip-flops to trailing edge triggering
all of the above

Correct Answer: all of the above

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