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Mathematics
Mathematics
Problem
In the expansion of
(
1
+
x
)
8
(1+x)^{8}
(
1
+
x
)
8
, the ratio of the
(
r
+
1
)
(r+1)
(
r
+
1
)
th term to the
r
r
r
th term equals
2
2
2
when
x
=
1
x=1
x
=
1
. Find the value of
r
r
r
.
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