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Mathematics
Problem
What is the coefficient of
x
5
x^{5}
x
5
in
(
1
+
x
)
10
−
(
1
−
x
)
10
(1+x)^{10}-(1-x)^{10}
(
1
+
x
)
10
−
(
1
−
x
)
10
? a)
252
252
252
b)
−
504
-504
−
504
c)
504
504
504
d)
420
420
420
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