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 →

perm & comb

Expert replies
Post new topic Post Reply
Previous Topic Next Topic
User avatar
Senior | Next Rank: 100 Posts
Posts: 46
Joined: Fri Aug 19, 2011 12:13 amFollowed by: 1 member
Location: Delhi, India
by romitvsingh » Tue Nov 22, 2011 12:25 am
Ten coins are tossed simultaneously. In how many of the outcomes will the third coin turn up a head?

(A) 210
(B) 29
(C) 3*28
(D) 3*29
(E) None of these

pls explain in detail
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Source: — Problem Solving |
Legendary Member
Posts: 966
Joined: Sat Jan 02, 2010 8:06 amFollowed by: 21 members
Thanked: 230 times

by shankar.ashwin » Tue Nov 22, 2011 12:32 am
Total possible outcomes are 2^10 = 1024.

Now in half the cases the 3rd coin will have a head and the other half will have tails.

So 512 (2^9) cases head and 512(2^9) cases tail. E IMO
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Junior | Next Rank: 30 Posts
Posts: 20
Joined: Fri Nov 18, 2011 11:28 pm
Location: Ludhiana ,Punjab, India
Thanked: 1 times

by vishal chugh » Tue Nov 22, 2011 3:29 am
each coin can have two outcomes either head or tell... so if u particular any outcomes. in the case , 3rd as head or tell. other 9 outcomes can be both head or tell. so total of 512 outcomes are there in which third outcome is head or tail
Top
Join the discussion
Log in to postLogin with Googleuse password
QUOTE IN REPLY
Post new topic Post Reply
• Page 1 of 1