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Geometric Sequences
medium
0:00.0
If
a
10
=
X
a_{10} = X
a
10
=
X
, what is
a
9
⋅
a
11
a_9 \cdot a_{11}
a
9
⋅
a
11
?
A
X
2
X^2
X
2
B
2
X
2X
2
X
C
X
X
X
D
X
/
2
X/2
X
/2
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