iran-konkur 2020 Q145

iran-konkur · Other · konkur-riazi_1399_specialized_old-curriculum Probability Definitions Probability Involving Algebraic or Number-Theoretic Conditions
145- A two-digit natural number is chosen at random. What is the probability that the chosen number is a multiple of 3 or 5?
\[ (1)\quad \frac{2}{5} \qquad (2)\quad \frac{3}{5} \qquad (3)\quad \frac{7}{15} \qquad (4)\quad \frac{8}{15} \]
\textbf{145-} A two-digit natural number is chosen at random. What is the probability that the chosen number is a multiple of 3 or 5?

\[
(1)\quad \frac{2}{5} \qquad (2)\quad \frac{3}{5} \qquad (3)\quad \frac{7}{15} \qquad (4)\quad \frac{8}{15}
\]