Discussion
How many flip-flops are required to build a MOD-16 counter ?
Answer: C
Correct answer: 4
A counter built from \(n\) flip-flops passes through \(2^n\) states, so a MOD-16 counter needs \(n = 4\) since \(2^4 = 16\). It counts 0 through 15 and then returns to 0.
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