Evaluate: 6P2

Question

Evaluate:  6P2

anonymous · Answer

A jar contains 5 peanut butter cookies, 3 carmel delight cookies, and 2 lemon cookies.  If two cookies are selected in succession, find the probability of of selecting a peanut butter followed by carmel, if you replace the first; without replacing the first

parthkohli · Answer

$$ 6P2 = {6! \over (6 - 2)!} \Longrightarrow {6! \over 4!}$$

parthkohli · Answer

Did you understand it till this point? @Pocket-Fire

anonymous · Answer

I understood it up until i had to introduce the factorial. I wasnt sure if i had to do the factorial of the bottom as well as the to, or just the bottom

parthkohli · Answer

I didn't get you. Rephrase that question, please?

anonymous · Answer

When I was going along and doing the problem, I was only applying the factorial (!) denominator and not to the numerator. I understand now :) Thank you.

parthkohli · Answer

Heh! You're welcome!

parthkohli · Answer

Remember $$ nPr = {n! \over (n - r)!} $$

anonymous · Answer

Will do! Thanks again!

parthkohli · Answer

You're welcome (=