Thursday

December 18, 2014

December 18, 2014

Posted by **please help me out!!** on Tuesday, April 2, 2013 at 4:06am.

- PROBAbility!!!! -
**Reiny**, Tuesday, April 2, 2013 at 8:55amnumber of ways to draw 3 balls from 150

= 150x149x148 = 3307800

But these include triplets of the form

ABC

ACB

BAC

BCA

CAB

CBA , that is , containing the same three numbers.

Only one of these 6 would have them in the correct increasing order ,so we divide 3307800 by 6 to get 551300

so the prob of your event = 551300/3307800

= 1/6

so a/b = 1/6, and a+b = 7

**Answer this Question**

**Related Questions**

Probabilities - A bag contains 150 balls numbered 1 through 150 . Three balls ...

Math - A bag contains 5red balls and 4 white balls. Two balls are drawn at ...

Maths :( - 41 different balls are drawn from a bag containing balls numbered 1,2...

Math - A bag contains 5 red balls and 4 white balls. Two balls are drawn at ...

College Discrete - An urn contains n > 0 white balls and m > 0 black ...

8th Grade Probability - A box contains 6 red balls, 4 white balls, and 5 green ...

Probability again - A box contains 6 red balls, 4 blue balls, and 2 green balls...

Basic Mathematics - A bag contains 2 red balls, 3 blue balls and 5 green balls. ...

******MATH 12******* - How about this. One bad contains 4 white balls and 6 ...

math - A box contains 6 red balls, 4 white balls, and 5 green balls. If three ...