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Decade counter count till 10 diffrents states so with 3 flipflop we can count upto 23 = 8 distinct state 

So for 10 distcnt state 4FF is needed. i.e. 24 = 16 [6 states are unused]

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4 flip flop needed as we have to count  from 0000 to 1001 10 different states need to be counted

by 3 ff we can have maximum of 2^3=8 states so minimum ffs required for this is 4 flip flops
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