Answers

2016-07-06T00:18:17+08:00
Given
An=4x-2y
A1=x+y
d=?
an=a1+(n-1)d
4x-2y=x+y+(4-1)d
4x-2y-x-y=3d
3x-3y=3d
x-y=d

x+y,2x,3x-y,4x-2y

(not sure)

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