If a, b, c are in AP, then which of the following is not an AP
(A) As a,b,c are in A.P.
So, are in AP (dividing the same term gives a new AP)
are in A.P.
(B)As a,b,c are in A.P.
So, are in A.P (multiplying the same term gives a new A.P)
(C) As a,b,c are in A.P.
So, are in A.P (Reverse of AP is also and AP)
Hence, (D) is not an AP
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