IOM 2021, Блиц — Задача 34

The Blitz-contest of IOM-2021

Условие

A bag contains the numbers $1, 2, 5, 7, 11$. Two numbers are randomly pulled out of the bag. What is the probability that one of the numbers divides the other?

If the answer is a fraction, it can be entered either as a decimal fraction or as a ratio “$r/s$”. Rounding is not allowed.

Отговори

Решение

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Оригинал в Архива: iom-2021-blitz-tasks-eng.pdf · официални решения: iom-2021-blitz-answers-eng.pdf