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Mathematics
Problem
Which one of the following binomial expansions contains a term independent of
x
x
x
? a)
(
x
2
+
4
x
)
7
\left(x^{2}+\dfrac{4}{x}\right)^{7}
(
x
2
+
x
4
)
7
b)
(
2
x
+
5
x
)
4
\left(2x+\dfrac{5}{x}\right)^{4}
(
2
x
+
x
5
)
4
c)
(
x
3
+
2
x
)
6
\left(x^{3}+\dfrac{2}{x}\right)^{6}
(
x
3
+
x
2
)
6
d)
(
2
x
2
+
3
x
)
5
\left(2x^{2}+\dfrac{3}{x}\right)^{5}
(
2
x
2
+
x
3
)
5
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