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What is the probability that it will rain tomorrow?

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by BTGmoderatorDC » Mon Sep 03, 2018 11:43 pm

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00:00

Answers

A

B

C

D

E

Stats

Difficulty—

What is the probability that it will rain tomorrow?

(1) The probability that it rains today is 40%.
(2) If it rains today, the probability that it will rain tomorrow will increase by 10%.

OA E

Source: Veritas Prep
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Source: — Data Sufficiency |

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by Jay@ManhattanReview » Tue Sep 04, 2018 1:06 am
BTGmoderatorDC wrote:What is the probability that it will rain tomorrow?

(1) The probability that it rains today is 40%.
(2) If it rains today, the probability that it will rain tomorrow will increase by 10%.

OA E

Source: Veritas Prep
Needless to say that the Statement 1 is insufficient since we do not have any info about tomorrow.

Statement 2 is also insufficient since we do not know that after the increase of the probability of tomorrow's rain what is the figure?

Even after combining the two statements, we cannot deduce this.

We have

Prob. of rain tomorrow (If rained today) = Prob. of rain tomorrow (If there is no rain) + 10%

We do not know Prob. of rain tomorrow (If rained today) and Prob. of rain tomorrow (If there is no rain). Insufficient.

The correct answer: E

Hope this helps!

-Jay
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