Answer / dk

in sr ff four nand gates can be used.first two nand gates have s & clk , r & clk as input respectively.the output of the first two ff and the next two are connected in ff fashion.
the construction of jk ff is same till this but a feedback is given to this ff. this is the difference bw sr and jk ff

Answer / divya

the construction is almost the same but here we give feedback.in sr ff we get forbidden condition that is y we use jk ff

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