The number of different output states a counter can produce is called the modulo or modulus of the counter. The Modulus (or MOD-number) of a counter is the total number of unique states it passes through in one complete counting cycle with a mod-n counter being described also as a divide-by-n counter.
https://www.electronics-tutorials.ws/counter/mod-counters.html
https://www.slideshare.net/ManojGuha1/modulo-n-counter
with above links - I can say we just need to count no. of states after which it comes back to original state. so in this case
0 0 0 1 0 0 0 1 0 1 0 1 0 1 1 Hence here after execution of 5 states on the next clock it again come back to 0 hence mod-5 counter.
Let me know if I am wrong.
64.3k questions
77.9k answers
244k comments
80.0k users