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Question Number 133696 by Mikael_786 last updated on 23/Feb/21

$$\mathrm{A}\mathrm{test}\mathrm{consists}\mathrm{of}\mathrm{four}\mathrm{questions}$$$$\mathrm{each}\mathrm{of}\mathrm{which}\mathrm{contains}\mathrm{five}\mathrm{alternative}$$$$\mathrm{answers},\mathrm{one}\mathrm{of}\mathrm{which}\mathrm{is}\mathrm{correct}.$$$$\mathrm{The}\mathrm{test}\mathrm{pass}\mathrm{condition}\mathrm{is}\mathrm{at}\mathrm{least}$$$$\mathrm{four}\mathrm{correct}\mathrm{answers}.\mathrm{A}\mathrm{student},\mathrm{not}$$$$\mathrm{knowing}\mathrm{the}\mathrm{test}\mathrm{subject},\mathrm{scored}\mathrm{the}$$$$\mathrm{answers}\mathrm{randomly}.\mathrm{How}\mathrm{is}\mathrm{the}$$$$\mathrm{probability}\mathrm{for}\mathrm{the}\mathrm{student}\mathrm{to}\mathrm{pass}?$$

Answered by Ar Brandon last updated on 23/Feb/21

$${\left(\frac{1}{5}\right)}^4$$

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