5. An urn contains nine balls of which three are red, four are blue and two are green. Three balls are drawn at random without replacement from the urn. The probability that the three balls have different colours is - (A) \( \frac{1}{3} \) (B) \( \frac{2}{7} \) (C) \( \frac{1}{21} \) (D) \( \frac{2}{23} \)

Dalam percobaan melempar 3 uang logam secara bersamaan, peluang muncul 3 angka adalah ....

b) Suppose that the time it takes a data collection operator to fill out an electronic form for a database is uniformly between 1.5 and 2.2 minutes i. What is the probability that it will take less than two minutes to fill out the form? ii. Determine the cumulative distribution function of the time it takes to fill out the form

اگر احتمال رویداد A برابر با 0.3 و احتمال رویداد B برابر با 0.4 باشد، احتمال هم‌زمانی این دو رویداد را محاسبه کنید.

Explain how the probability of two independent events occurring together is calculated.

Какова вероятность выпадения орла, если монета подброшена дважды?