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09 Jan 2024, 02:30
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
63% (02:05) correct
37%
(02:01)
wrong
based on 321
sessions
History
Date
Time
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Not Attempted Yet
If x is the sum of all odd numbers between 1001 and 2000, inclusive and y is the sum of all even numbers between 1001 and 2000, inclusive, what is the value of \(x – y\)?
A. -1000
B. -500
C. 0
D. 500
E. 1000
A. -1000
B. -500
C. 0
D. 500
E. 1000
09 Jan 2024, 10:47
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Bunuel
OA is B
Posted from my mobile device
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General Discussion
Archit3110
09 Jan 2024, 04:25
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sum of consecutive even numbers
n * ( n+2)/4
and for odd ( n+1)^2 /4
find sum from 0 -2000 of both odd & even
later subtract sum of both odd & even from 1001 and 2000
we get -500
option B
n * ( n+2)/4
and for odd ( n+1)^2 /4
find sum from 0 -2000 of both odd & even
later subtract sum of both odd & even from 1001 and 2000
we get -500
option B
Bunuel
