Question 48

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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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