A) 120
B) 450
C) 570
D) 620
Correct Answer: C
Solution :
\[20\left\langle \begin{align} & 10\,odd \\ & 10\,even \\ \end{align} \right.\] \[^{10}{{C}_{3}}{{+}^{10}}{{C}_{1}}.{{\,}^{10}}{{C}_{2}}\,=120\,+450\,=570\]
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