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Consider the set S = {2, 3, 4, ...., 2n+1), where n is a positive inte
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01 Jan 2020, 02:08
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62% (02:45) correct 38% (02:40) wrong based on 13 sessions
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Consider the set S = {2, 3, 4, ...., 2n+1), where n is a positive integer larger than 2007. Define X as the average of the odd integers in S and Y as the average of the even integers in S. What is the value of X – Y?
Re: Consider the set S = {2, 3, 4, ...., 2n+1), where n is a positive inte
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01 Jan 2020, 05:41
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Even set = {2,4,6,8,...2n} Odd set = {3,5,7,9,...2n+1}
By property, if a certain number x is added to all elements of a set, the average of the set increases by x
By this property, since the odd set is just the even set with 1 added to all elements, the average of the odd set must be 1 greater than the average of the even set
So X-Y=1
Answer is (B)
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gmatclubot
Re: Consider the set S = {2, 3, 4, ...., 2n+1), where n is a positive inte
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01 Jan 2020, 05:41
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62% (02:45) correct 
