我不知道怎么把图片弄上来,谁能帮帮忙,怎么连附件都不可以呢。说总共四个颜色,Y, G, B, R, 从左到右,从上到下,为Y,G,Y,B,R,B,G,Y,G.正方形为11边长,Y为边长3的SQUARE,SAY throw something, the probability fall in either B or R is 1/3. so what's the probablity fall in area of red.
4/33,答案正确
见26楼的图,谢谢manasarovar
解答:
用面积来算,area of B is 2*hight*(3+4)/2=hight*7, area of R is hight*(3+5)/2=4*hight,
probability of getting R=P{R}*1/3=4/(7+4)*1/3=4/33