Verified Answer :

Panoyin

\(_nC_r = \frac{n!}{(n - r)!r!}\)
\(_1_0C_4 = \frac{10!}{(10 - 4)!4!}\)
\(_1_0C_4 = \frac{10!}{6!4!}\)
\(_1_0C_4 = \frac{10 * 9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1}{6 * 5 * 4 * 3 * 2 * 1 * 4 * 3 * 2 * 1}\)
\(_1_0C_4 = \frac{10 * 9 * 8 * 7}{4 * 3 * 2 * 1}\)
\(_1_0C_4 = \frac{90 * 56}{12 * 2}\)
\(_1_0C_4 = \frac{5040}{24}\)
\(_1_0C_4 = 210\)

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