@JohnRennie It's becoming good, our juniors have got many intern offers this year (like interns hiring in our college is before placement) during our time very less people received interns from campus
The sentence is "The spectrum of this signal is X(f) = M(f) + 1 2 (δ(f − f0) + δ(f + f0)) and its bandwidth equals to Wx = f0. " which I don't get it should be at least 2f0 if we consider f0>W