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Jill has applied for a job with each of two different companies. What

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Jill has applied for a job with each of two different companies. What  [#permalink]

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New post 15 Aug 2018, 06:20
1
dave13 wrote:
AbdurRakib wrote:
Jill has applied for a job with each of two different companies. What is the probability that she will get job offers from both companies?

1) The probability that she will get a job offer from neither company is 0.3
2) The probability that she will get a job offer from exactly one of the two companies is 0.5

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hello Bunuel chetan2u, pushpitkc :-)

could you please give me an example/ problem based on this formula P(A∪B) = P(A)+P(B)-P(A)*P(B)) I want to see how it differs from this one
P(A∪B) = P(A)+P(B)-P(A∩B)

thank you:)


Hi..

There is no difference in the two..

Independent events..
Events where outcomes of each event is not dependent on other.
For example getting a head on each of the two coins..
P(A∩B)=P(A)*P(B)=1/2*1/2=1/4

Mutually exclusive events.
That is one event cannot occur if second is occurring.
Say getting 1 or 2 in a roll of dice
So P(A∩B)=0 as intersection is 0
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1) Absolute modulus : http://gmatclub.com/forum/absolute-modulus-a-better-understanding-210849.html#p1622372
2)Combination of similar and dissimilar things : http://gmatclub.com/forum/topic215915.html
3) effects of arithmetic operations : https://gmatclub.com/forum/effects-of-arithmetic-operations-on-fractions-269413.html


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Re: Jill has applied for a job with each of two different companies. What  [#permalink]

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New post 02 Sep 2018, 09:28
P(A)+ P(B) - P(A&B)+ neither = 1

0.5 - P(A&B) + 0.3 = 1 ( from st 2, we get the value of P(A)+ P(B) =0.5)

P(A&B) =0.2

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Re: Jill has applied for a job with each of two different companies. What  [#permalink]

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New post 02 Sep 2018, 09:31
P(A) +P(B) - P(A&B) +Neither = 1

0.5- P(A&B) +0.3 =1 ( From St2 we get the value of P(A) +P(B) = 0.5)

P(A&B) = 0.2

Ans C
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Jill has applied for a job with each of two different companies. What  [#permalink]

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New post 05 Sep 2018, 08:33
A tip: Don't mess with formulas in this kind of questions. Use Venn diagrams - make your life easier. The guy above has uploaded a good video.
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Jill has applied for a job with each of two different companies. What &nbs [#permalink] 05 Sep 2018, 08:33

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