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1. If {an} and {bn} are convergent, then {an士bn} and {anbn} are also convergent
2. If {an} and {bn} are convergent and there exists a constant k>0 such that |bn| > k for all n=1, 2, ..., then {an/bn} is also convergen
2. If {an} and {bn} are convergent and there exists a constant k>0 such that |bn| > k for all n=1, 2, ..., then {an/bn} is also convergen