Convolution - Shortcut Method - 01 - GATE Sol | Signals & Systems | EC/EE/IN

Given two continuous time signals x(t) = e^(-t) and y(t) = e^(-2t) which exist for t is greater than 0 the convolution z(t) = x(t) * y(t) is
(A) (e^(-t)-e^(-2t) )u(t) (C) (e^(+t) )
(B) (e^(-3t) )u(t) (D) (e^(-t)+e^(-2t) )

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