cuz 2^4=16.... therefore the first 4 input mux has 16 o/p..
hence four-4 i/p mux are required to fill all 16 leads.
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As of July 2014, the market cap for McEwen Mining Inc. (MUX) is
$706,322,326.55.
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MUX(A, B, S) = A*S + B*S'
NOT(A) = MUX(0, 1, A) = 0*A + 1*A' = A'
From http://noyesno.net/
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a mux has many i/ps & 1 o/p but a router connects many n/ws
and the may or may not be of same kind a mux does not follow an
algo but router follows algo such as dikakstra bellman ford or any
other or a combination.......