Question 7

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waecmaths question: 

A fair coin is tossed three times. Find the probability of getting two head and one tail 

Option A: 

$\tfrac{1}{2}$

Option B: 

$\tfrac{3}{8}$

Option C: 

$\tfrac{1}{4}$

Option D: 

$\tfrac{1}{8}$

waecmaths solution: 

$\begin{align}  & \Pr (H)=\tfrac{1}{2} \\ & \Pr (T)=\tfrac{1}{2} \\ & \Pr (HHT)=\tfrac{1}{2}\times \tfrac{1}{2}\times \tfrac{1}{2}=\tfrac{1}{8} \\\end{align}$

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