【#GRE留學外語考試# #GRE數學考點：AT least One#】學習是一個長期堅持的過程，每天進步一點點，基礎扎實一點點，日積月累，考試就會更容易一點點。以下為“GRE數學考點：AT least One”，歡迎閱讀參考！更多相關訊息請關注©無憂考網！
AT least One
If probability of event A happening is p and event B happening is q, then
the probability that at least one of them happens is (p+q).
Example:
There are 20 quarters, 33 nickels, and 47 pennies in a jar. The probability
that a randomly selected coin is a quarter= 20/(20+33+47)=20/100=0.2 and the
coin is nickel = 33/100 =0.33.The probability it is either a quarter or a nickel
= 0.2+0.33=0.53.
Remember:
The events needs to be mutually exclusive, that is if one happens the other
cannot happen: a coin is either a quarter or nickel but not both.
