JEE MATHEMATICS MCQ: PERMUTATIONS

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Application +4 | -1

A telegraph has 5 arms and each arm is capable of 4 distinct positions, including the position of rest. The total number of signals that can be made is

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Correct option: B

1023

Option B (1023) is correct because each arm has 4 possible states, and we subtract 1 to exclude the case where all arms are at rest.

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