Drop Nth element from List alternative soltuion

DropNth.scala

http://aperiodic.net/phil/scala/s-99/p16.scala

Mine

def dropNth[A](n: Int, ls: List[A])=
 ls.grouped(n).flatMap(_.take(n-1)).toList

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val li=List('a, 'b, 'c, 'd, 'e, 'f, 'g, 'h, 'i, 'j, 'k)

dropNth(1,li)                                     //> res1: List[Symbol] = List()
dropNth(99,li)                                    //> res2: List[Symbol] = List('a, 'b, 'c, 'd, 'e, 'f, 'g, 'h, 'i, 'j, 'k)
dropNth(2,li)                                     //> res2: List[Symbol] = List('a, 'c, 'e, 'g, 'i, 'k)
dropNth(3,li)                                     //> res3: List[Symbol] = List('a, 'b, 'd, 'e, 'g, 'h, 'j, 'k)
dropNth(3,List('a))                               //> res4: List[Symbol] = List('a)