+1 vote
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A new flag of ISI club is to be designed with $5$ vertical strips using some or all of the four colors: green, maroon, red and yellow. In how many ways this can be done so that no two adjacent strips have the same color?

1. $120$
2. $324$
3. $424$
4. $576$
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Hence total number of ways of coloring the strips of the flag = $4*3*3*3*3$ = $324$ ways