a,a-2 and 3a are in AP,then find the value of a?
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d=a-2-a=3a-a+2. (as common difference is
:. -2=2a+2. always equal in an AP)
:. -4=2a
:. a=-2
:. -2=2a+2. always equal in an AP)
:. -4=2a
:. a=-2
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