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Mathematics
Problem
Which one of the following polynomials is necessarily odd? a)
x
5
+
1
x^{5}+1
x
5
+
1
b)
3
x
5
+
2
x
3
3x^{5}+2x^{3}
3
x
5
+
2
x
3
c)
x
4
−
x
2
x^{4}-x^{2}
x
4
−
x
2
d)
x
3
+
x
2
x^{3}+x^{2}
x
3
+
x
2
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