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A digital computer has a common bus system for 16 registers of 32 bits each. The bus is constructed
with multiplexers.

[i] How many selection inputs are there in each multiplexer?
[ii] What size of multiplexers is needed?
[iii] How many multiplexers are there in the bus?

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According to formua if there are N number of K bit register,then there should be K number of NX1 Mux

so according to your question

2)16X1 sized multiplexer needed

3)32 multiplexers are there in bus

1)4 selection input are there in the multiplexer

correct me if i am wrong   MORRIS MANO PAGE 99
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