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0<p<1 Quantity A: The greatest value of p(1-p) Quantity B: 1/2
0<p<1 Quantity A: The greatest value of p(1-p) Quantity B: 1/2
admin
2019-05-11
34
问题
0<p<1
Quantity A: The greatest value of p(1-p)
Quantity B: 1/2
选项
A、Quantity A is greater.
B、Quantity B is greater.
C、The two quantities are equal.
D、The relationship cannot be determined from the information given.
答案
B
解析
p(1-p)=-p
2
+p=-(p-1/2)
2
+1/4,或由二次函数对称轴方程x=-b/2a=-1/2可知,当p=1/2时,该式达到最大值为1/4,1/4<1/2,故答案为B。
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本试题收录于:
GRE QUANTITATIVE题库GRE分类
0
GRE QUANTITATIVE
GRE
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