Set K consists of a finite number of consecutive odd integers. If x is the smallest number in K and y is the greatest, then y - x =
(1) The average (arithmetic mean) of set K is -36.
(2) There are 8 numbers in set K.
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consecutive odd (magoosh - very hard)
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gopinathhyd
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killer1387
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gopinathhyd wrote:Set K consists of a finite number of consecutive odd integers. If x is the smallest number in K and y is the greatest, then y - x =
(1) The average (arithmetic mean) of set K is -36.
(2) There are 8 numbers in set K.
1. only we could know that the number of terms is even.
i.e. .........-37, -35...........(even no.)
insufficient
2. suppose
the series is
n, n+2, n+4......n+14 where n is any odd integer.
that are 8 term
difference =14
hence B is correct
Last edited by killer1387 on Sat Mar 10, 2012 7:40 am, edited 1 time in total.
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gopinathhyd
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Even I thought C, but ans was B, I did not understand,
Since the question does not say anything on positive and negative numbers,(we get two different answers when we consider -ve odd consecutive and all +ve odd consecutives,) I think the question is wrong in magoosh, or my solution is wrong.
Since the question does not say anything on positive and negative numbers,(we get two different answers when we consider -ve odd consecutive and all +ve odd consecutives,) I think the question is wrong in magoosh, or my solution is wrong.
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killer1387
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No B is correct I had missed out please check my post abovegopinathhyd wrote:Even I thought C, but ans was B, I did not understand,
Since the question does not say anything on positive and negative numbers,(we get two different answers when we consider -ve odd consecutive and all +ve odd consecutives,) I think the question is wrong in magoosh, or my solution is wrong.
* in the difference "n" will get cancelled so it is immaterial if its positive or negative
