This question was previously asked in

ISRO Scientist CS 2015 Official Paper

- 10 flip-flops
- 12 flip-flop
- 8 flip-flop
- 6 flip-flop

Option 2 : 12 flip-flop

**Concept:**

A ring counter requires ‘n’ flipflops for ‘n’ number of states.

**Explanation:**

A modulus-12 counter has 12 states starting from 0000 to 1011 and hence at least 12 bits are required to design a modulus-12 counter.

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