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nCr Definitions and Properties

The number of...

Question

The number of different signals that can be send with three dots and two dashes are

A

5

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B

6

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C

10

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D

20

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Solution

The correct option is B 10
Total number of signals $= \frac{5!}{3! .2!} = 10$ ways
[As 3 dots are identical and 2 dashes are identical]
Hence, option 'C' is correct.

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nCr Definitions and Properties

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