[計量] CAT test5 3題問題
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)
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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?
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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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