Probability-Ice cream

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sulabh: Master | Next Rank: 500 Posts; Posts: 189; Joined: Mon Apr 07, 2008 2:29 amFollowed by: 2 members; Thanked: 5 times; GMAT Score:750

by sulabh » Sat Jun 28, 2008 9:58 pm

There are only three varities of ice creams in Jokaland priced at Rs 5,Rs 10 and Rs 15.If, Arun buys 4 ice creams for Rs 45 from Jokaland, then what is the probability that any two of them together will cost exactly Rs 20 ?

A.1/2
B.1/4
C.3/4
D.3/8
E.5/12

Answer and my explanation after discussion.

750(Q50,V40)

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Source: Beat The GMAT — Problem Solving | Sat Jun 28, 2008 9:58 pm

TrizMA: Senior | Next Rank: 100 Posts; Posts: 36; Joined: Sun Jun 22, 2008 5:47 am

by TrizMA » Sun Jun 29, 2008 2:55 pm

is answer E: 5/12?

Only two comibination of 4 ice cream for Rs.45 are possible

i) 5,10,15,15
ii) 10,10,10,15

i)5,10,15,15
total 6 combination possible. two combinations give 20

ii) 10,10,10,15
total 6 combination possible. three combinations give 20

Total desired combinations=5
Total combinations=12

prob=5/12

pls tell if it's correct

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sulabh: Master | Next Rank: 500 Posts; Posts: 189; Joined: Mon Apr 07, 2008 2:29 amFollowed by: 2 members; Thanked: 5 times; GMAT Score:750

by sulabh » Mon Jun 30, 2008 12:55 am

Yup thats right.

750(Q50,V40)

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TrizMA: Senior | Next Rank: 100 Posts; Posts: 36; Joined: Sun Jun 22, 2008 5:47 am

by TrizMA » Mon Jun 30, 2008 1:02 am

sulabh, u wrote:

i)5,10,15,15
total 6 combination possible. 3 combinations give 20

pls show three combinations which give 20.

i can only count 2 combinations. 1)5,15 2)5,15.

what's the third combination which gives 20?

If OA 1/2, then there must be some other approach to this. What's the OA?

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TrizMA: Senior | Next Rank: 100 Posts; Posts: 36; Joined: Sun Jun 22, 2008 5:47 am

by TrizMA » Mon Jun 30, 2008 1:05 am

sorry sulabh, my bad. a blopper

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beeparoo: Master | Next Rank: 500 Posts; Posts: 200; Joined: Sun Jun 17, 2007 10:46 am; Location: Canada; Thanked: 9 times

Re: Probability-Ice cream

by beeparoo » Wed Jul 02, 2008 8:35 am

sulabh wrote:There are only three varities of ice creams in Jokaland priced at Rs 5,Rs 10 and Rs 15.If, Arun buys 4 ice creams for Rs 45 from Jokaland, then what is the probability that any two of them together will cost exactly Rs 20 ?

A.1/2
B.1/4
C.3/4
D.3/8
E.5/12

Answer and my explanation after discussion.

Did you make up this question, sulabh? If so, I have some questions for you.

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