sat一道数学题On a square gameboard that is divided into n row of n squ_数学解答

sat一道数学题
On a square gameboard that is divided into n row of n squares each,k of these squares lie along the boundary of the gameboard.Which of the following is a possible value for
A.10 B.25 C.34 D.43 E.52
不明白题目在说什么哟……………………

人气：109 ℃　时间：2020-05-01 17:21:13

解答

题目
一个正方形的棋盘上分成了相等的n*n的小正方形,有k个这样的小正方形是在大棋盘的外沿上,那么问k的可能取值.
简单计算得知k=4（n-1）
将所有选项作为k值代入上式,得出n为整数者为答案.
答案选E