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Two systems with impulse responses  $h_{1}(t)$ and $h_{2}(t)$ are connected in cascade. Then the overall impulse response of the cascaded system is given by

  1.  product of  $h_{1}(t)$ and $h_{2}(t)$
  2.  sum of $h_{1}(t)$ and $h_{2}(t)$
  3. convolution of  $h_{1}(t)$ and $h_{2}(t)$
  4.  subtraction of $h_{2}(t)$ from $h_{1}(t)$
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