arectangulargameboardiscomposedofidenticalsquaresarrangedinarectangulararrayofrrows
a:r^2-r
b:r^2-1
c:r^2
d:r^2+1
e:r^2+r
arectangulargameboardiscomposedofidenticalsquaresarrangedinarectangulararrayofrrowsandr+1columns.therrowsarenumberedfrom1throughr,andther+1columnsarenumberedfromrthroughr+1,if人》10,whichofthefollowingrepresentsthenumberofsquaresontheboardthatareneitherinthe4thrownorinthe7thcolumn