Kindly tell me which option is correct and what is reason for that
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Why not try and see what you come up with.
so option (b) is correct
Am i right
Why post here if you ignore the responses? Danny suggested you try x(t)= 0. That would give, of course, for all k. And y(t)= 1 so while for all k> 0. That does not match "b".
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