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Mathematics
Mathematics
Problem
If the constant term in the binomial expansion of
(
x
−
k
x
2
)
10
\left(\sqrt{x} - \frac{k}{x^2}\right)^{10}
(
x
−
x
2
k
)
10
is 405, then
∣
k
∣
|k|
∣
k
∣
equals (a) 9 (b) 1 (c) 3 (d) 2
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