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Find the number of different signals th...

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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for 2 flags `5*4 = 20`
for 3 flags`5*4*3= 60`
for 4 flags `5*4*3*2 = 120`
for 5 flags `5*4*3*2*1 = 120`
total ways= `20+60+120+120`
`=320`
answer
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