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Q.

A telegraph post has 4 arms. Each arm is capable of 3 distinct positions including the position of rest. The total number of signals that can be made is

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a

12

b

80

c

43−1

d

34−1

answer is B, D.

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Detailed Solution

Total number of signal =34−1

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A telegraph post has 4 arms. Each arm is capable of 3 distinct positions including the position of rest. The total number of signals that can be made is