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# M04-28

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Math Expert
Joined: 02 Sep 2009
Posts: 42578

Kudos [?]: 135427 [0], given: 12694

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15 Sep 2014, 23:23
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Difficulty:

5% (low)

Question Stats:

95% (00:29) correct 5% (00:34) wrong based on 145 sessions

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10 applicants are interviewed for a position. Among them are Paul and Jen. If a randomly chosen applicant is invited to interview first, what is the probability to have neither Paul nor Jen at the first interview?

A. $$\frac{1}{10}$$
B. $$\frac{1}{9}$$
C. $$\frac{1}{2}$$
D. $$\frac{4}{5}$$
E. $$\frac{9}{10}$$
[Reveal] Spoiler: OA

_________________

Kudos [?]: 135427 [0], given: 12694

Math Expert
Joined: 02 Sep 2009
Posts: 42578

Kudos [?]: 135427 [0], given: 12694

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15 Sep 2014, 23:23
Official Solution:

10 applicants are interviewed for a position. Among them are Paul and Jen. If a randomly chosen applicant is invited to interview first, what is the probability to have neither Paul nor Jen at the first interview?

A. $$\frac{1}{10}$$
B. $$\frac{1}{9}$$
C. $$\frac{1}{2}$$
D. $$\frac{4}{5}$$
E. $$\frac{9}{10}$$

Probability of inviting Paul or Jen first is $$0.1+0.1=0.2$$; probability of inviting neither first is $$1- 0.2 = 0.8=\frac{4}{5}$$

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Kudos [?]: 135427 [0], given: 12694

Intern
Joined: 10 May 2017
Posts: 27

Kudos [?]: 0 [0], given: 0

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30 Jun 2017, 22:29
"OR" type problem again.

Selecting Paul for interview = 1/10
Selecting Jena for interview = 1/10

"OR" means addition, so , (1/10) + (1/10) = 2/10

Not getting selected is 1-(2/10)= 8/10 or 4/5

Kudos [?]: 0 [0], given: 0

Manager
Joined: 12 Jun 2016
Posts: 226

Kudos [?]: 46 [0], given: 149

Location: India
WE: Sales (Telecommunications)

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07 Sep 2017, 02:09
Hello!

I have a question in this. Is there a possibility of GMAT testing this trap - I mean, not giving choices in their reduced form? Here the answer is 4/5 but choice is 8/10 (Which of course is one and the same). Though I got this right, It took me time to realize that the right answer choice is not in reduced form.

I read in some prep book that GMAT always gives answer choices in the reduced form. So, curious to know about this. Do not want to fall for this again

Thanks!
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My Best is yet to come!

Kudos [?]: 46 [0], given: 149

Math Expert
Joined: 02 Sep 2009
Posts: 42578

Kudos [?]: 135427 [0], given: 12694

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07 Sep 2017, 02:13
susheelh wrote:
Hello!

I have a question in this. Is there a possibility of GMAT testing this trap - I mean, not giving choices in their reduced form? Here the answer is 4/5 but choice is 8/10 (Which of course is one and the same). Though I got this right, It took me time to realize that the right answer choice is not in reduced form.

I read in some prep book that GMAT always gives answer choices in the reduced form. So, curious to know about this. Do not want to fall for this again

Thanks!

I would not call this a trap but yes, the options will be in reduced form. Edited.
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Kudos [?]: 135427 [0], given: 12694

Re: M04-28   [#permalink] 07 Sep 2017, 02:13
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# M04-28

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