Jambmaths question:
Find the number of ways of selecting 6 out of 10 subjects for an examination
Option A:
218
Option B:
216
Option C:
215
Option D:
210
Jamb Maths Solution:
$\begin{align} & \text{No of possible selection}{{=}^{n}}{{C}_{r}}=\frac{n!}{r!(n-r)!} \\ & {{=}^{10}}{{C}_{6}}=\frac{10!}{6!(10-6)!} \\ & =\frac{10!}{4!6!}=\frac{\text{3628800}}{24\times 720} \\ & =210 \\\end{align}$
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