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

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

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Control Systems
What is the full form of SPICE ?

 None of these.
 Stimulated program with integrated circuit arrangement.
  Simulated program with integrated circuit analysis.
 Sequential program with integrated circuit analysis.

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