Let x1(t) and x2(t) be periodic signals with fundamental periods T1 a – McqOptions

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1.	Let x1(t) and x2(t) be periodic signals with fundamental periods T1 and T2 respectively. Which of the following must be a rational number for x(t)=x1(t)+x2(t) to be periodic?
A.	T1+T2
B.	T1-T2
C.	T1/T2
D.	T1*T2
Answer» D. T1*T2

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