6. Which of the following represent the corrrect transient states which exist between the two ripple counter states shown below?

      (0011)
        |
        V 
      (????)  transient state #1 
        | 
        V 
      (????)  transient state #2 
        | 
        V 
      (0100)

0001 0010
0000 0010
0110 0101
0010 0000
1000 1001

4 is CORRECT. 3 bits will change when the counter transits between count states QDQCQBQA = 0011 to 0100. Transient state #1 is entered when QA goes 1 to 0. Next, transient state #2 is entered when QB goes 1 to 0. Finally, count state 0100 is entered when QC goes 0 to 1. Note the ripple effect: QA changes, then QB changes, followed by QC. Here is the filled in state graph:

      (0011)  State 3
          |
          V 
      (0010)  transient state #1 
         | 
         V 
      (0000)  transient state #2 
        | 
        V 
      (0100)  State 4

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