christopherluckey7
18.11.2020 •
Mathematics
A shipment of ten smartphones contains five with cracked screens. If sold in a random order, what is the probability that at least two of the first four sold have cracked screens
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Ответ:
Step-by-step explanation:
•••••for 12+4=4, solution is null
•••••but for x^2-49=0
x^2=49
i.e,x=±7
clearly ,2nd/B is correct option