The unit step function of the train of pulse is—

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The unit step function of the train of pulse is—

1. I = u (t) – u (t – T) + 2u (t – 2T) – u (t – 3T) + u (t – 5T) – u (t – 6T)
2. I = u (t) + u (t –T) + u (t –3T) – u (t – 5T) + u (t – 6T)
3. I = u (t) – u (t –T) – u (t –3T) + u (t – 5T) + u (t – 6T)
4. None of the above.

Correct Option: A

I = u (t) + u (t – T) – u (t –3T) + u (t – 5T) – u (t – 6T)