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$$\frac{51!-50!}{50!-49!}$$=
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Of the people surveyed about the effectiveness of various treatments for insomnia, 65 percent reported that prescription drugs were effective and 48 percent reported that exercise was effective. If 22 percent of those surveyed reported that prescription drugs were effective but did not report that exercise was effective,what percent of those surveyed reported that exercise was effective but did not report that prescription drugs were effective?
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维度一：数学常识
2023.9.22改革后GRE考试数学Quant两个Section的题目数量和完成时间分别为？
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GRE数学不定项选择题（标志词Indicate all such...）的正确答案可能选几个？
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维度二：数学术语
GRE数学题中“perpendicular”是什么意思？
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GRE数学题中“percentile”是什么意思？
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维度三：数学表述
当题目问“What percent of A is B?”时，正确的计算公式应该是？
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当题目问“A is how much percent greater than B?”时，正确的计算公式应该是？
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当题目提到“The number of people who register for the course each month is at least 5 and at most 30"，正确的理解是？
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维度四：数学概念
“1”是质数吗？
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余数一定要小于除数吗？
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当题干提到事件A与事件B是相互独立的(independent)，请问事件A与事件B能同时发生吗？
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维度五：数学公式
连续整数的数个数公式：从整数a到整数b，包含两端，共计有多少个整数？
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多边形内角和公式：如果n多边形有n条边，那么这个n多边形所有内角度数和是？
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组合数公式：以下哪个是正确的组合数的计算公式？
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