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GMAT数学which of the following lists the number of points at w

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GMAT数学
which of the following lists the number of points at which a circle can intersect a triangle?
a) 2 and 6 only
b)2,4 and 6 only
c)1 2 3 6
d)1 2 3 4 6
e)1 2 3 4 5 6
完全不知道这个是干什么的,
Tanya prepared 4 different letters to be sent to 4
different addresses.For each letter,
she prepared an envelope with its correct address.If the 4 letters are to be put into the 4
envelopes at random,what is the probability that only 1 letter will be put
into the envelope with its correct address?
是不是有什么公式要记?
我也看不懂
你让津桥国际学院的老师帮你看看吧!