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How many signals can be formed with 5 di...

How many signals can be formed with 5 different colours flags, if there are two flags in every signal?

A

10

B

20

C

30

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
B
No. of results for first flag = 5 No. of results for second flag = 4
`:.` Total required signals `= 5 xx 4 = 20`
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