1.

What_is_the_necessary_and_sufficient_condition_for_a_sum_of_a_periodic_continuous_time_signal_to_be_periodic?

A. Ratio of period of the first signal to period of other signals should be constant
B. Ratio of period of the first signal to period of other signals should be finite
C. Ratio of period of the first signal to period of other signals should be real
D. Ratio of period of first signal to period of other signal should be rational
Answer» E.


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