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  1. A 4 bit ripple counter starts in 0000 state. When the counter reads 0010 the number of clock pulses which have occurred is

    2. A.
    2
    B.
    18
    C.
    2 or 18
    D.
    2 or 18 or 34

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    Answer : Option D

    Explanation :

    At pulse 1 the state changes to 0001 and at pulse 2 it changes to 0010 Since it has a total of 16 states, the counter returns to 0000 after 16 and 32 pulses.

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