BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

Redeem
TTP OnDemand GMAT Video Course
Featured Course

Target Test Prep GMAT OnDemand

Scott Woodbury-Stewart’s private virtual classroom — 400 hours of master-class video lessons for the GMAT Focus Edition.

  • 715+ score guarantee — highest in the industry (99th percentile)
  • 52 chapters · 1,500+ lessons · 4,000+ practice questions
  • 400 hours of video · 1,500+ instructor-led HD smartboard lessons
  • 300,000+ students accepted to Harvard, Stanford, Wharton, Booth & Sloan & more
  • 24/7 live support + weekly Zoom office hours with GMAT instructors
  • TTP AI Assist — 24/7 AI-powered virtual tutor for instant help
  • 1,200+ flashcards + AI-powered study assistant & daily calendar
  • OnDemand, LiveTeach & GMAT Bootcamp formats available
  • Also: GRE, SAT Math & Executive Assessment courses
  • MBA Admissions Consulting now available
  • 🏆 2025 EdTech Breakthrough Award: Test Prep Solution Provider of the Year
  • 200,000+ students served
  • 5-day free trial — $0 to start, no auto-billing, cancel anytime
★★★★★ 5.0 (559 reviews)
130-pt guarantee
$0 to start then $127/mo
Start Free 5-Day Trial Read 559 Reviews →

Probability

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
Junior | Next Rank: 30 Posts
Posts: 23
Joined: Mon Feb 08, 2010 8:19 am
Location: Norway
Thanked: 1 times
by C » Tue Apr 13, 2010 11:00 pm
A florist has 2 azaleas, 3 buttercups, and 4 petunias. She puts two flowers together at random in a bouquet. However, the customer calls and says she does not want two of the same flower. What is the probability that the florist does not have to change the bouquet?

OA is [spoiler]13/18[/spoiler]

Source is MGMAT Word Translations, answer choices were not given. I did not understand the explanation, can someone please solve and explain?

Thanks
Top
Join the discussion
Log increate an account to reply.
Source: — Problem Solving |
User avatar
Legendary Member
Posts: 1560
Joined: Tue Nov 17, 2009 2:38 amFollowed by: 5 members
Thanked: 137 times

by thephoenix » Tue Apr 13, 2010 11:58 pm
What is the probability that the florist does not have to change the bouquet? ---->MEANS THE florist has kpt two diff flowers
so we need to find the probability of keeping two diff flowers in the bouquet
which is same as 1- probability of keeping two same flowers in the bouquet
probability of keeping two same flowers in the bouquet=(2C2+3C2+4C2)/9C2=10/36
REQD PROBABILITY=1-10/36=26/36=13/18
Top
Join the discussion
Log increate an account to reply.
User avatar
Master | Next Rank: 500 Posts
Posts: 208
Joined: Sun Sep 28, 2008 12:30 pm
Thanked: 22 times

by neoreaves » Wed Apr 14, 2010 12:17 am
2A, 3B, 4P

Total = 9

Probability of picking both A = 2/9 x 1/8
Probability of picking both B = 3/9 x 2/8
Probability of picking both P = 4/9 x 3/8

Probability of picking same = 2/9 x 1/8 + 3/9 x 2/8 + 4/9 x 3/8 = 20/72

Probability she wont have to change the flowers = Probability of not picking same = 1 - 20/72 = 13/18
Top
Join the discussion
Log increate an account to reply.
Post new topic Post Reply
• Page 1 of 1