Control Systems
Number of sign changes in the entries in 1st column of Routh array denotes the no. of

 zeroes of system in RHP.
 roots of characteristic polynomial in RHP.
 open loop zeroes in RHP.
 open loop poles in RHP.

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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 unstable and at least one system is causal.
 at least one system is causal and all systems are unstable.

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