Question

На Веселых стартах в параллели 5 классов проводились соревнования по прыжкам в мешках. Всего 75 участников разбили на тройки. Найдите вероятность того,что Вася выступает из 5Б выступает в четвертой тройке.

Answer 1

75/3=25
4/25=0.16
Ответ: Р(теория вероятности)=0.16
Всё.

Answer 2

Calculation of Probability

To find the probability that Vasya, who is from class 5B, will perform in the fourth trio, we need to determine the total number of trios and the number of trios that Vasya can be a part of.

Given that there are 75 participants divided into trios, we can calculate the total number of trios by dividing the total number of participants by 3:

Total number of trios = 75 participants / 3 = 25 trios

Since Vasya is from class 5B, we need to determine the number of trios that include at least one participant from class 5B. To do this, we need to consider the number of ways we can select two participants from the remaining 74 participants (excluding Vasya) and one participant from class 5B.

Number of trios with Vasya from class 5B = (Number of ways to select 2 participants from 74) * (Number of ways to select 1 participant from 1) = C(74, 2) * C(1, 1)

Using the formula for combinations, C(n, r) = n! / (r! * (n-r)!), we can calculate the number of trios with Vasya from class 5B.

Let's calculate the probability now.