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# M02#6

Author Message
Senior Manager
Status: Do and Die!!
Joined: 15 Sep 2010
Posts: 312

Kudos [?]: 601 [0], given: 193

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03 Jan 2011, 10:54
If a group of five women is participating in a 400 meter race in preparation for the Olympics, then what is the probability that either Jenny or Sally win the race?

$$1/5$$
$$14/15$$
$$2/5$$
$$1/2$$
$$3/5$$

P(j) = $$1/5$$
P(s)=$$1/4$$

p ( j or s ) = $$1/5 +1/4$$ = $$9/20$$

what's going wrong
_________________

I'm the Dumbest of All !!

Kudos [?]: 601 [0], given: 193

Manager
Joined: 20 Dec 2010
Posts: 168

Kudos [?]: 64 [0], given: 5

Location: Stockholm, Sweden

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03 Jan 2011, 11:21
1/5 + 1/5 = 2/5 ?

Since they cannot both win, (PnB) = 0, and P(AuB) = P(A)+P(B)+0
_________________

12/2010 GMATPrep 1 620 (Q34/V41)
01/2011 GMATPrep 2 640 (Q42/V36)
01/2011 GMATPrep 3 700 (Q47/V39)
02/2011 GMATPrep 4 710 (Q48/V39)
02/2011 MGMAT CAT 1 650 (Q46/V32)
02/2011 MGMAT CAT 2 680 (Q46/V36)
02/2011 MGMAT CAT 3 710 (Q45/V41)

Kudos [?]: 64 [0], given: 5

Re: M02#6   [#permalink] 03 Jan 2011, 11:21
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# M02#6

Moderator: Bunuel

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