how to take the freq response of function

my h1(n) = delta(n) -delta(n-1) and h2(n) = u[n]-u[n-5]
what is freq response of h2(n)
How can we calculate the impulse response of overall system
h(n) = h1(n) * h2(n)
plz plz help me

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am 24 Okt. 2011

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