A) Not in A.P./G.P./H.P.
B) In A.P.
C) In G.P.
D) In H.P.
Correct Answer: D
Solution :
\[a,b,c,d\] are in A.P. Þ \[\frac{a}{abcd},\frac{b}{abcd},\frac{c}{abcd},\frac{d}{abcd}\] are in A.P. \[\therefore \,\frac{1}{bcd},\frac{1}{acd},\frac{1}{abd},\frac{1}{abc}\] are in A.P. \[\therefore bcd,acd,abd,abc\] are in H.P. \[\therefore \] In reverse order abc,\[abd,\,acd,\,bcd\] are in H.P.
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