help

[timid egret]

Help me pls !! I keep on getting different results

[cyan crow]

1. Wait patiently for a helper to come along.
2. Once someone helps you, say thank you and close the thread with:

+close

3. Feel free to nominate the person for helper of the week in #helper-nominations
4. Do not ping the mods, unless someone is breaking the rules.
5. If you're happy with the help you got here, and the server overall, you can contribute financially as well:

[warped anchor]

what does the question want

[steady oriole]

Can you show what you did?

[timid egret]

Find n

[warped anchor]

ohhh

is it an ap or smthng like that

[steady oriole]

What do you mean by "ap"?

[timid egret]

What's ap?

[warped anchor]

arithmetic progression

mb lol

[steady oriole]

Hm... I can't exactly see it very well.
If you want, I can show how I would approach this, then you tell whether you did the same thing.

[timid egret]

This is supposed to be about possibilities so idrk

[timid egret]

Yess i would appreciate it !!

[warped anchor]

yeah, i was wrong

[steady oriole]

Let's see.
9C(n, 2) = 2C(2n, 2)
9n(n - 1)/2 = 2(2n)(2n - 1)/2
9n(n - 1) = 4n(2n - 1)
n(9(n - 1) - 4(2n - 1)) = 0
n(n - 5) = 0
So, n = 0 or n = 5.

[timid egret]

Thanx a lott !!

[steady oriole]

Did you get the same answer?

[honest kraken]

@timid egret has given 1 rep to @steady oriole

[timid egret]

Not yet i am still trying

[timid egret]

+close