My Math Forum Probability Interview Question
 User Name Remember Me? Password

 Probability and Statistics Basic Probability and Statistics Math Forum

 August 14th, 2018, 09:43 AM #1 Newbie   Joined: Aug 2018 From: United States Posts: 3 Thanks: 0 Probability Interview Question Toss a coin until the nth Head turns up. Let Y = number of required tosses, calculate P(Y is even), set p=P(H), q=P(T). Last edited by skipjack; August 14th, 2018 at 11:05 AM.
 August 14th, 2018, 01:53 PM #2 Global Moderator   Joined: May 2007 Posts: 6,807 Thanks: 717 $P(Y=n)=q^{n-1}p$. Therefore $P(Y\ is\ even)=p\sum_{k=1}^{\infty}q^{2k-1}=\frac{pq}{1-q^2}=\frac{q}{1+q}$ Thanks from AAA Last edited by mathman; August 15th, 2018 at 04:22 PM. Reason: add material

 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post ameliaaa Career Guidance 5 November 9th, 2016 09:19 PM Telpjmal New Users 5 May 22nd, 2012 12:22 PM daigo Algebra 2 February 17th, 2012 09:25 AM

 Contact - Home - Forums - Cryptocurrency Forum - Top

Copyright © 2019 My Math Forum. All rights reserved.