What is the probability of selecting a white ball from a jar at random?

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What is the probability of selecting a white ball from a jar at random?

by BTGmoderatorLU » Thu Jun 01, 2023 5:08 pm

00:00

A

B

C

D

E

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Source: Veritas Prep

What is the probability of selecting a white ball from a jar at random?

1. There are twice as many white balls as balls of all other colors combined

2. There are $$30$$ more white balls than balls of all other colors combined

The OA is A

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Re: What is the probability of selecting a white ball from a jar at random?

by GMATJourneyman » Sat Jun 03, 2023 1:10 pm

00:00

A

B

C

D

E

Global Stats

BTGmoderatorLU wrote:
Thu Jun 01, 2023 5:08 pm
Source: Veritas Prep

What is the probability of selecting a white ball from a jar at random?

1. There are twice as many white balls as balls of all other colors combined

2. There are $$30$$ more white balls than balls of all other colors combined

The OA is A
Statement 1 indicates that the number of white balls is double the number of all other balls combined. In probability terms, you're two times more likely to select a white ball than any other color. This makes the probability 2/3, which is sufficient to answer the question.

However, statement 2 only tells us that there are 4 more white balls than all other colors combined, but it doesn't give us the total number of balls. Therefore, we can't determine the exact probability, making this statement insufficient.

So, the correct answer is indeed A - the first statement is sufficient, but the second isn't.

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