Find the number of different signals that can be generated by arranging at least 2 flags in order

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Find the number of different signals that can be generated by arranging at least 2 flags in order (one below the other) on a vertical staff, if five different flags are available.
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Mann...thhoda toh khud bhi interest dikhaaoo
kya nariyal awaaz hai -Sorry!

Underrated_dinesh