My Math Forum probability formula needed

 Probability and Statistics Basic Probability and Statistics Math Forum

 March 31st, 2015, 03:34 PM #1 Newbie   Joined: Mar 2015 From: usa Posts: 2 Thanks: 0 probability formula needed There are 13 marbles numbered 1 thru 13 in a bag. You are given 17 chances to choose number 3 marble replacement allowed. What is the formula? Thanks. Last edited by mathminor; March 31st, 2015 at 04:13 PM.
March 31st, 2015, 09:02 PM   #2
Math Team

Joined: Dec 2006
From: Lexington, MA

Posts: 3,267
Thanks: 407

Hello, mathminor!

Quote:
 There are 13 marbles numbered 1 thru 13 in a bag. You are given 17 chances to choose number 3 marble, replacement allowed. $\;$What is the formula?

What is the probability that you do not get a "3" in 17 tries?

$P(\text{no 3 in 17 tries}) \;=\;\left(\frac{12}{13}\right)^{17} \;\approx\;0.2565$

$\text{Therefore: }\:P(\text{at least one 3 in 17 tries}) \;=\;1\,-\,0.2565 \;=\;0.7435$

 Tags formula, needed, probability

 Thread Tools Display Modes Linear Mode

 Similar Threads Thread Thread Starter Forum Replies Last Post zulfi123786 Elementary Math 2 May 21st, 2014 08:41 AM rdam81 Algebra 5 August 5th, 2013 03:19 AM RUXXIAN Algebra 10 October 12th, 2012 07:59 AM soorajth Applied Math 8 April 15th, 2009 04:54 AM brainstormery Algebra 1 November 3rd, 2008 02:42 PM

 Contact - Home - Forums - Cryptocurrency Forum - Top