My Math Forum I need help to calculate a simple problem in probability

 Probability and Statistics Basic Probability and Statistics Math Forum

 October 25th, 2017, 08:14 PM #1 Newbie   Joined: Oct 2017 From: Camboja Posts: 5 Thanks: 0 I need help to calculate a simple problem in probability Hi folks, i'm not from math field, but i have a question, 1- If in 10 times of event A will occur 2 times event B inside A 2- i know that the chance of event B to occur in sequence is 9, right? x x | | | | | | | | 1 | x x | | | | | | | 2 | | x x | | | | | | 3 | | | x x | | | | | 4 | | | | x x | | | | 5 | | | | | x x | | | 6 | | | | | | x x | | 7 | | | | | | | x x | 8 | | | | | | | | x x 9 3- Then i question, how can i calculate how many times can event B occur NOT in sequence? and how to calculate it? for example | x | x | | | | | | thanks a lot for any help
 October 25th, 2017, 09:52 PM #2 Senior Member     Joined: Sep 2015 From: USA Posts: 2,100 Thanks: 1093 There are $\dbinom{10}{2}=45$ ways that 2 x's can occur out of the 10 events. You showed there are 9 ways that the two x's can occur sequentially. Thus there are 45-9=36 ways the two x's can occur non-sequentially. Last edited by romsek; October 25th, 2017 at 09:55 PM.
 October 25th, 2017, 09:59 PM #3 Newbie   Joined: Oct 2017 From: Camboja Posts: 5 Thanks: 0 thanks for answering, i was thinking it was way more thank 100 possibilities, have a nice day

 Tags calculate, probability, problem, simple

 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post beesee Probability and Statistics 1 November 1st, 2014 03:50 PM limes5 Probability and Statistics 9 April 5th, 2014 05:34 AM drwmn Probability and Statistics 1 October 10th, 2011 10:03 AM Tyster Algebra 2 September 27th, 2009 04:48 PM johnny Algebra 4 August 2nd, 2009 03:33 AM

 Contact - Home - Forums - Cryptocurrency Forum - Top