Let x1(t) and x2(t) be periodic signals with fundamental periods T1 an – 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.	T<sub>1</sub>+T<sub>2</sub>
B.	T<sub>1</sub>-T<sub>2</sub>
C.	T<sub>1</sub>/T<sub>2</sub>
D.	T<sub>1</sub>*T<sub>2</sub>
Answer» D. T<sub>1</sub>*T<sub>2</sub>

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