Number of flip flops required?

Question

For the counting sequence 100, 200, 300 , 400 , 100 (repeat), the number of flip flops required are ?

Answer 1

i think 2 flipflops are enough

Comments

how??

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because there are only 4 different states...and to remember it only 2 bits are required

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Can u please give a circuit diagram for this if possible? Thanks in advance

Answer 2

for four no we need 2 flip flops

Comments

how ?