M={-6,-5,-4,-3,-2}
T={-2,-1,0,1,2,3}
If an integer is to be randomly selected from set M above and an integer is to be randomly selected from set T above, what is the probability that the product of the two integers will be negative?
A. 0
B. 1/3
C. 2/5
D. 1/2
E. 3/5
答案是D
我的想法是M集合都是負數, 所以選中負數的機率是100%
T集合6個數中有兩個是負數, 所以選中負數的機率是1/3
感覺上好像怪怪的
結果果然錯了...
不知道是那裡想錯了...
想請各位大大代為解惑
麻煩各位了...
謝謝!!!
