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Every multivibrators have two states:quasi stable and stable state.

quasi stable state are triggered state, when a trigger pulse is given the vibrator reaches this state.

For example,

Astable multivibrators have no triggers so,two stable states.

Monostable multivibrators have one trigger so,one stable and one quasi stable which is invoked by the trigger.Same for the Bistable in which two sates are invoked by two triggers.

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