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  1. Two discrete time systems with impulse responses h1[n] = δ[n - 1] and h2[n] = δ[n - 2] are connected in cascade. The overall impulse response of the cascaded system is

    2. A.
    δ[n - 1] + δ[n - 2]
    B.
    δ[n - 4]
    C.
    δ[n - 3]
    D.
    δ[n - 1] + δ[n - 2]

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    Answer : Option C

    Explanation :

    h1(n) → delay by 1, h2(n) → delay by 2,

    h1(n) * h2(n) → delay by 3.

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