Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

You are not logged in.

#1 2012-12-17 02:19:48

jacks
Member
Registered: 2012-11-21
Posts: 125

probability

Two no. are selected from the set

without replacement one by one .

Then the probability that minimum of 2 no. is

Offline

#2 2012-12-17 02:42:16

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 104,734

Re: probability

Hi jacks;

Fairly simple to just enumerate:

If I draw a six, I have 3 numbers to pick, same for a 5 and a 4. So that is 3 * 3 = 9

If I draw a 3, I have 5 numbers to pick, same with 2 and 1. So 3 * 5 = 15.

Probability is 4 / 5.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
A number by itself is useful, but it is far more useful to know how accurate or certain that number is.

Offline

#3 2012-12-17 02:45:39

jacks
Member
Registered: 2012-11-21
Posts: 125

Re: probability

Thanks bobbym

But I did not understand the meaning of minimum of 2 no. is < 4 (whta does it mean)

Offline

#4 2012-12-17 02:57:01

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 104,734

Re: probability

Say you pick a 6 and then a 4, remember without replacement means no two numbers are the same.

The minimum of a 6 and a 4 is 4. It means the smallest value out of the two numbers picked.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
A number by itself is useful, but it is far more useful to know how accurate or certain that number is.

Offline

#5 2012-12-17 03:00:02

jacks
Member
Registered: 2012-11-21
Posts: 125

Re: probability

Thanks bobbym got it

Offline

#6 2012-12-17 03:02:47

bobbym
Administrator
From: Bumpkinland
Registered: 2009-04-12
Posts: 104,734

Re: probability

Okay, you are welcome.


In mathematics, you don't understand things. You just get used to them.
If it ain't broke, fix it until it is.
A number by itself is useful, but it is far more useful to know how accurate or certain that number is.

Offline

Board footer

Powered by FluxBB