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GRE數(shù)學(xué)考點(diǎn):AT least One

時(shí)間:2019-03-15 11:49:00   來(lái)源:無(wú)憂考網(wǎng)     [字體: ]
【#GRE留學(xué)外語(yǔ)考試# #GRE數(shù)學(xué)考點(diǎn):AT least One#】學(xué)習(xí)是一個(gè)長(zhǎng)期堅(jiān)持的過(guò)程,每天進(jìn)步一點(diǎn)點(diǎn),基礎(chǔ)扎實(shí)一點(diǎn)點(diǎn),日積月累,考試就會(huì)更容易一點(diǎn)點(diǎn)。以下為“GRE數(shù)學(xué)考點(diǎn):AT least One”,歡迎閱讀參考!更多相關(guān)訊息請(qǐng)關(guān)注©無(wú)憂考網(wǎng)!




  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.