Editor
The next three terms of the following arithmetic progression x+y, x-y, x-3y.... are
Difficulty: Easy
A: 
x-5y, 3x-7y, -7x-9y
B: 
-x+3y, -9x+y,-x-7y
C: 
x-4y, x-5y, x-6y
D: 
x-5y, x-7y, x-9y
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