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What is number of possible outputs if there is 7 line digital input?

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What is number of possible outputs if there is 7 line digital input?

(a) 64

(b) 32

(c) 16

(d) 128

The question was asked by my college director while I was bunking the class.

Asked question is from Comparison Between FM and PM in chapter Noise of Analog Communications

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Right option is (d) 128

Explanation: Total possible outputs will be 2^7 which is equal to 128.

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