Find the K'th element of a list

	;; P03 (*) Find the K'th element of a list.
	;; The first element in the list is number 1.
	;; Example:
	;; * (element-at '(a b c d e) 3)
	;; C
	#lang racket
	(provide element-at)
	(define (element-at lst n)
	(list-ref lst (- n 1)))

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