In a J-K flip-flop we have J = Q¯ , and K = 1 (see figure). Assuming the flip-flop was initially cleared and then clocked for 6 pulses, the sequence at the
Flip-flops
Digital Circuits - Flip-Flops
flipflop - How can a 74LS76 JK Flip Flop's outputs Q and Q-bar not be fully complementary? - Electrical Engineering Stack Exchange