Hello everyone. i need help in solving these four problems on D flip-flops shown in the attached pdf file. Please provide me with their answers if possible. thanks.

 

hi,
As this is a college project please post your attempt at solving the problem, we can guide you through the work.
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As this forum title says, we provide Homework Help, as a tutor would, not Homework Answers.

First you need to learn the behavior (truth-table) of a D flip-flop for the various input ports (if you don't already know).
Then we can help you solve the problems.