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Mathematics
Mathematics
Problem
If the coefficients of the
r
th
r^{\text{th}}
r
th
,
(
r
+
1
)
th
(r+1)^{\text{th}}
(
r
+
1
)
th
&
(
r
+
2
)
th
(r+2)^{\text{th}}
(
r
+
2
)
th
terms in the expansion of
(
1
+
x
)
14
(1+x)^{14}
(
1
+
x
)
14
are in AP, find
r
r
r
.
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