If an integer is randomly selected from all positive 2-digit integers, what is t

游客2024-01-12 61

问题 If an integer is randomly selected from all positive 2-digit integers, what is the probability that the integer chosen has
(a)a 4 in the tens place?
(b)at least one 4 in the tens place or the units place?
(c)no 4 in either place? [br]

选项

答案 4/5

解析

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