Re: [計量] CAT test5 3題問題
※ 引述《sqaure (sqaure)》之銘言：
: 9. If (a+b)^1/2 = (a-b)^-1/2 , which of the following must be true?
: (a) b = 0
: (b) a + b = 1
: (c) a - b = 1
: (d) a^2 + b^2 = 1
: (e) a^2 - b^2 = 1
: ans : (e)
(a+b)^1/2 = (a-b)^-1/2
[(a+b)*(a-b)]^1/2=1
(a^2-b^2)^1/2=1
a^2-b^2=1
: ===================================================================
: 11. In Town X, 64 percent of the population are employed,
: and 48 percent of the population are employed males.
: What percent of the employed people in Town X are females?
: ans : (B) 25 %
: why : My equation is 1 * 64% * (1-48%) = 33.28 % ~= 32%(C)
: something wrong?
: ===================================================================
: 27. A photographer will arrage 6 people of 6 different heights for
: photography by placing them in two rows of three so that each
: person in the first row is standing in front of someone in the
: second row. The heights of the people within each row must
: increase from left to right , and each person standing in front
: of him or her.
: How many such arrangements of the 6 peoples are possible?
: ans : (A) 5
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11/06 18:47, , 1F
11/06 18:47, 1F
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