Question

В урні лежать 3 чорні, 2 червоні, 5 зелених і 6 синіх кульок. Із неї навмання виймають одну кульку. Яка ймовірність того, що вона не червона?​

Answer 1

перше знайдемо ймовірність червоних кульків

P(A)=m/n=2/(3+5+6+2)=2/16=1/8

ймовірність не червоних кульків є інверсия від ймовірністі червоних кульків, тобто треба відняти від 1 ймовірність червоних кульків

P(A)ₙ=1-P(A)=1 - 1/8=7/8

Відповідь:7/8

Answer 2

Probability of Drawing a Non-Red Ball from the Urn

To calculate the probability of drawing a non-red ball from the urn, we can use the following approach:

1. Total Number of Balls in the Urn: - There are a total of 3 black, 2 red, 5 green, and 6 blue balls in the urn.

2. Probability Calculation: - The probability of drawing a non-red ball can be calculated by considering the total number of non-red balls (black, green, and blue) and dividing it by the total number of balls in the urn.

3. Calculation: - The probability of drawing a non-red ball = (Total non-red balls) / (Total number of balls in the urn)

Applying the Calculation

The probability of drawing a non-red ball from the urn can be calculated as follows:

- Total non-red balls = 3 (black) + 5 (green) + 6 (blue) = 14 - Total number of balls in the urn = 3 (black) + 2 (red) + 5 (green) + 6 (blue) = 16

So, the probability of drawing a non-red ball from the urn is:

Probability = Total non-red balls / Total number of balls in the urn Probability = 14 / 16 Probability = 7 / 8

Therefore, the probability of drawing a non-red ball from the urn is 7/8.