GMAT Question of the Day - Daily to your Mailbox; hard ones only

 It is currently 21 Aug 2019, 20:43

### GMAT Club Daily Prep

#### Thank you for using the timer - this advanced tool can estimate your performance and suggest more practice questions. We have subscribed you to Daily Prep Questions via email.

Customized
for You

we will pick new questions that match your level based on your Timer History

Track

every week, we’ll send you an estimated GMAT score based on your performance

Practice
Pays

we will pick new questions that match your level based on your Timer History

# M05-10

Author Message
TAGS:

### Hide Tags

Director
Joined: 22 Nov 2018
Posts: 534
Location: India
GMAT 1: 640 Q45 V35
GMAT 2: 660 Q48 V33

### Show Tags

15 Jun 2019, 23:23
pm0103 wrote:
Bunuel wrote:
There are 6 cards numbered from 1 to 6. They are placed into a box, and then one is drawn and put back. Then another card is drawn and put back. If the sum of the two cards was 8, what is the probability that one of the cards drawn was a 5?

A. 1
B. $$\frac{2}{3}$$
C. $$\frac{1}{2}$$
D. $$\frac{2}{5}$$
E. $$\frac{1}{3}$$

Hello Bunuel,
Could you please point out mistake in my interpretation:
(Probability of drawing a 5 and a 3 ) * 2 ( for reverse of it)
1/6 * 1/6 * 2 = 1/18

pm0103 You are ignoring the fact that the stem says sum of the numbers picked is 8. You are trying to arrive at the prob of picking 3 and 5 initially from 1-6 cards with repetition, where as the question says already the cards are picked and you have a sum of 8(4,4/6,2/2,6/3,5/5,3) and requires what is the prob of one of the cards being a 5. Which is 2/5.

Hope this helps!

Posted from my mobile device
_________________
Give +1 kudos if this answer helps..!!
M05-10   [#permalink] 15 Jun 2019, 23:23

Go to page   Previous    1   2   [ 21 posts ]

Display posts from previous: Sort by

# M05-10

Moderators: chetan2u, Bunuel