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
⇒
are in AP.⇒
are in AP.⇒ bcd, cda, abd, abc are in HP.
⇒ abc, abd, cda,bcd are in HP
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