Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: √ ∞ ≠ ≤ ≥ ≈ ⇒ ∈ Δ θ ∴ ∑ ∫ π -

Login

Username

Password

Not registered yet?

#1 2012-12-18 01:19:48

jacks
Full Member

Offline

probability

Two no. are selected from the set

without replacement one by one .

Then the probability that minimum of 2 no. is

#2 2012-12-18 01:42:16

bobbym
Administrator

Online

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.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

#3 2012-12-18 01:45:39

jacks
Full Member

Offline

Re: probability

Thanks bobbym

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

#4 2012-12-18 01:57:01

bobbym
Administrator

Online

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.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

#5 2012-12-18 02:00:02

jacks
Full Member

Offline

Re: probability

Thanks bobbym got it

#6 2012-12-18 02:02:47

bobbym
Administrator

Online

Re: probability

Okay, you are welcome.


In mathematics, you don't understand things. You just get used to them.
I have the result, but I do not yet know how to get it.
All physicists, and a good many quite respectable mathematicians are contemptuous about proof.

Board footer

Powered by FluxBB