A bag contain 12 blue, 10 Yellow, and 9 White ball what is probability

1.	A bag contain 12 blue, 10 Yellow, and 9 White ball what is probability that, when 2 ball are selected both are white?1. 37/1552. 12/1373. 12/1554. 155/12
Answer» Correct Answer - Option 3 : 12/155 Formula used: ⁿC_r = n!/{(n-r)! × r!} Calculation: Let S be the sample space then, n(S) = Number of way of selecting 2 balls out of 31 ball ⇒ ³¹C₂ = 31!/[(31– 2)! × 2!] ⇒ (31 × 30)/2 ⇒ 465 Let E be the event of getting both white balls N(E) = ⁹C₂= (9 × 8)/2 ⇒ 36 P(A) = n(E)/n(S) ⇒ 36/465 ⇒ 12/155 ∴ Probability of getting 2 white ball is 12/155

A bag contain 12 blue, 10 Yellow, and 9 White ball what is probability that, when 2 ball are selected both are white?1. 37/1552. 12/1373. 12/1554. 155/12

Answer» Correct Answer - Option 3 : 12/155

Formula used:

ⁿC_r = n!/{(n-r)! × r!}

Calculation:

Let S be the sample space then,

n(S) = Number of way of selecting 2 balls out of 31 ball

⇒ ³¹C₂ = 31!/[(31– 2)! × 2!]

⇒ (31 × 30)/2

⇒ 465

Let E be the event of getting both white balls

N(E) = ⁹C₂= (9 × 8)/2

⇒ 36

P(A) = n(E)/n(S)

⇒ 36/465

⇒ 12/155

∴ Probability of getting 2 white ball is 12/155

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A bag contain 12 blue, 10 Yellow, and 9 White ball what is probability that, when 2 ball are selected both are white?1. 37/1552. 12/1373. 12/1554. 155/12

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