A bag contains 4 white , 5 red and 6 blue balls. Three balls are drawn at rand dom from the bag .The probability that all of them are red.is :

Created: 5 years ago | Updated: 4 months ago

Updated: 4 months ago

\frac{1}{22}

\frac{2}{91}

\frac{3}{22}

\frac{2}{77}

অফিসার (ক্যাশ ) - Sonali | Rupali | BD Krishi | Rajshahi Krishi Unnayn | Investment Corporation Of Bangladesh - ২৯. ০৩.২০১৯ গণিত সম্ভাব্যতা (Probability)

ব্যাখ্যা

453

Best Ans:

Let S be the sample space
Then, n(S) = number of ways of drawing 3 balls out of 15
= 15C3 = (15 × 14 × 13)/(3 × 2 × 1) = 455
Let E = event of getting all the 3 red balls
∴n(E) = 5C3 = 5C2 = (5 × 4)/(2 × 1) = 10
∴P(E) = n(E)/n(S) = 10/455 = 291

5 years ago

0 0

Md Azizur Rahman

Founder of Satt

সম্ভাব্যতা (Probability)

Edit

A bag contains 4 white , 5 red and 6 blue balls. Three balls are drawn at rand dom from the bag .The probability that all of them are red.is :

সম্ভাব্যতা (Probability)

Related Question

Satt policy

Main Features

Follow us

Promotion