Control Systems
Two identical first order systems have been cascaded non interactively. The unit step response of the systems will be

 un damped
 under damped
 Over damped
 critical damped

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Control Systems
A cascade of three linear time invariant systems is causal and unstable. From this we conclude that

 at least one system is unstable and at least one system is causal.
 at least one system is causal and all systems are unstable.
 the majority are unstable and the majority are causal.
 each system in the cascade is individually caused and unstable.

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