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A rectangular game board is composed of identical squares arranged in a rectangular array of r rows and r+1 columns. The r rows are numbered from 1 through r, and the r+1 columns are numbered from 1 through r+1. If r>10, which of the following represents the number of squares on the board that are neither in the 4th row nor in the 7th column?
A. r² -r B. r² - 1 C. r² D. r² +1 E. r² +r
做题的时候就没懂题目说的啥意思,google了下发现是去掉第4排和第7列后还有多少方块,那个语法大师给普及下这个neither..nor是啥用法? |
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