[計量] 對..對不起又來問數學JJ了~"~!
官方127
of the 20 students in a class, half of the students are boys. A 7 member
committee is to formed, out of which 6 are girls.
col a: the probability that 7th is also a girl
col b: 3/5 答案:B
官方說A=2/7 是因為題目說外面有6個所以委員會有4個女的~
然後最後兩個連續是女生 所以2/7嗎@@?
官方130
in how many ways, three X and two Y can be arranged in a line, such that
no Y are together? 答案是6
這...小弟排列組合很弱小...有甚麼C幾取幾的算法嗎@@?
官方145
if N=(-2)^x, where x is a negative integer and -5<x<-1. What is the different
bwteen man and min possible values of N? 答案:3/8
這一題不就帶-4 跟-2下去算嗎@@? 所以就(-2)^-2=1/4 減掉 (-2)^-4=1/16
=3/16 嗎@@@@@@@!為什麼答案是3/8呢~"~?
又是一堆基本的問題...抱歉又要麻煩各位神人大大了.....T口T
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