a new math to confirm

liziyao

1. The possibility that the value of Stock A will increase is 0.34 and the possibility that stock B will increase is 0.68. What is the biggest possibility that neither will happen? (I am not sure about the numbers.)
I am not very sure if I was correct for this question, therefore I prefer not to mislead you. However, the answer is absolutely not (1-0.34)*(1-0.68).
我的答案：1-0。34*0。68

liziyao

p(no a nob)=p(noa)+p(nob)-p(noa+nob)a,b 相斥时
p(no a nob)=p(noa)p(nob) a,b 独立时。
根据这道题，应该是独立的，所以应用第二个公式
zhouxh,你的公式写错了吧？上面的公式是我刚查过的。