The sequence s1 ,s2 ,s3 , . . . , sn , . . . is such that sn=1n −1n+1 for all integer n≥1 , If k is a positive integer ,is the sum of the first k terms of the sequence greater than 910 ?(1 ) k > 1 0(2) k < 1 9
If p, q, x, y, and z are different positive integers, whichof the five integers is the median?(1) p + X < Q(2) y < zIf p, q, x, y, and z are different positive integers, whichof the five integers is the median?(1) p + X < Q(2) y < zIf p, q, x, y, and z are different positive integers, whichof the five integers is the median?(1) p + X < Q(2) y < z
In a two-month survey of shoppers, each shopper bought one of two brands of detergent, X or Y, in the first month and again bought one of these brands in the second month. In the survey, 90 percent of the shoppers who bought Brand X in the first month 1 bought Brand X again in the second month, while 60 percent of the shoppers who bought Brand Y in the first month bought Brand Y again in the second month. What percent of the shoppers bought Brand Y in the second month?( 1) In the first month, 50 percent of the shoppers bought Brand X.(2) The total number of shoppers surveyed was 5,000.In a two-month survey of shoppers, each shopperbought one of two brands of detergent, X or Y, in thefirst month and again bought one of these brandsin the second month. In the survey, 90 percent ofthe shoppers who bought Brand X in the first month1 bought Brand X again in the second month, while60 percent of the shoppers who bought Brand Y in thefirst month bought Brand Y again in the second month.What percent of the shoppers bought Brand Y in thesecond month?( 1) In the first month, 50 percent of the shoppersbought Brand X.(2) The total number of shoppers surveyed was5,000.
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12G备考资料