Progression (Sequence and Series)Hard

Question

Let the positive numbers a, b, c, d be in AP. Then abc, abd, acd, bcd are

Options

A.not in AP / GP / HP
B.in AP
C.in GP
D.in HP

Solution

Since, a, b, c, d are in AP.
⇒         are in AP.
⇒         are in AP.
⇒         bcd, cda, abd, abc are in HP.
⇒         abc, abd, cda,bcd are in HP

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