design a decade counter which counts in the sequence:
0000, 0001, 0010, 0011, 0100, 0101, 0110, 0111, 1000, 1001, 0000
a)use D flip-flops
b)use J-K flip flops
c)use S-R flip flops
d)use T flip-flops
e)draw a complete state diagram for the counter of (b) showing what happens when the counter is started in each of the unused states