iran-konkur 2016 Q148

iran-konkur · Other · konkur-riazi_1395_specialized Probability Definitions Probability Involving Algebraic or Number-Theoretic Conditions
148. From the set of consecutive integers $\{300, 301, \ldots, 51\}$... wait: $\{300, 301, \ldots, 51\}$, i.e., $\{300, 301, \ldots, 451\}$, a number is chosen at random. What is the probability that this number is divisible by 6 but not by 7 and not by 42?
(1) $0/24$ (2) $0/26$ (3) $0/28$ (4) $0/31$
\textbf{148.} From the set of consecutive integers $\{300, 301, \ldots, 51\}$... wait: $\{300, 301, \ldots, 51\}$, i.e., $\{300, 301, \ldots, 451\}$, a number is chosen at random. What is the probability that this number is divisible by 6 but not by 7 and not by 42?

(1) $0/24$ \quad (2) $0/26$ \quad (3) $0/28$ \quad (4) $0/31$