Find the number of ways of selecting 6 out of 10 subjects for an examination
\(^{10}C_6 = \frac{10!}{(10-6)!6!}\\ =\frac{10!}{4!6!}\\ =\frac{10\times 9\times 8 \times 7 \times 6!}{4\times 3\times 2\times 1 \times 6!}\\ =210\)
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