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Mathematics
Problem
If
a
a
a
,
b
b
b
,
c
c
c
,
d
d
d
are in G.P., then
(
a
3
+
b
3
)
−
1
(a^3 + b^3)^{-1}
(
a
3
+
b
3
)
−
1
,
(
b
3
+
c
3
)
−
1
(b^3 + c^3)^{-1}
(
b
3
+
c
3
)
−
1
,
(
c
3
+
d
3
)
−
1
(c^3 + d^3)^{-1}
(
c
3
+
d
3
)
−
1
are in (1) A.P. (2) G.P. (3) H.P. (4) None of these
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