The homework question just defines @colors and @drop and says to remove the things in drop from colors, that's it.
In that case, the "easiest" way to go about it would probably be to build a hash from the @drop array, and to use grep to filter the @colors array. I could write these two lines of code for you, but since this is homework (thanks for letting us know, by the way), it's probably best if you see if you can figure it out :-) But feel free to ask any questions about it here, or ask if you get stuck!
Hint: See "Data: Arrays" in perlfaq4 (just ignore the stuff about ~~, that's still experimental).
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