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# The stock price of Company X has a 60% chance of increasing on Monday

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Math Expert
Joined: 02 Sep 2009
Posts: 61302
The stock price of Company X has a 60% chance of increasing on Monday  [#permalink]

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26 Nov 2019, 01:04
00:00

Difficulty:

35% (medium)

Question Stats:

59% (01:16) correct 41% (01:22) wrong based on 29 sessions

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The stock price of Company X has a 60% chance of increasing on Monday and a 30% chance of increasing on Tuesday. Assuming the two probabilities are independent, what is the probability that the stock price of Company X increases on at least one of these days?

A. 22%
B. 30%
C. 45%
D. 72%
E. 90%

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Senior Manager
Joined: 13 Feb 2018
Posts: 498
GMAT 1: 640 Q48 V28
Re: The stock price of Company X has a 60% chance of increasing on Monday  [#permalink]

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26 Nov 2019, 04:06
1
For me, it's comfortable to use 1-n
I will count that we will have an increase on neither day and then deduct from 1 to have the prob that at least one increase happens

No increase on Monday = 0.4
No increase on Tuesday = 0.7

Prob of no increase on both days=0.4*0.7=0.28
Prob of at least one increase = 1-0.28=0.72

IMO
ANs: D
Re: The stock price of Company X has a 60% chance of increasing on Monday   [#permalink] 26 Nov 2019, 04:06
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