Question 2
A school has 100 pupils, 10 of whom have previously had Covid-19. Three pupils are selected at random. What is the probability that at least one of them has not previously had Covid-19?
Original printed choices: A) 0,9; B) 0,95; C) 0,99; D) 0,995; E) 0,999
Editorial note: Explain whether the printed question and choices are consistent. Give the literal mathematical result and distinguish any intended correction.
Original printed choices: A) 0,9; B) 0,95; C) 0,99; D) 0,995; E) 0,999
Editorial note: Explain whether the printed question and choices are consistent. Give the literal mathematical result and distinguish any intended correction.