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It is required to construct a 2n to 1 multiplexer by using 2 to 1 multiplexers only. How many of 2 to 1 multiplexers are needed?
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- n
- 22n
- 2n–1
- 2n+1
- n
Correct Option: A
To construct a 2n to 1 multiplexer by using 2 to 1 multiplexer, the number of 2 to 1 multiplex required are 2n– 1. For example, n = 3 means we have to construct 8 to 1 multiplexer. So we need 2n – 1 = 7, 2 to 1 multiplexer.
