(n)= 210 , find the value of n, where n ≥ 2.

. 2

sorry the 2 is supposed to be under n inside the bracket , as in n choose 2. or^{n}C_{2. i have no idea how to do this i got it for homework despite the fact that we never did it in class. }

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- Mar 22nd 2013, 05:04 PMamyl95probability
(

**n**)**= 210 , find the value of n, where n ≥ 2.**

**. 2**

sorry the 2 is supposed to be under n inside the bracket , as in n choose 2. or^{n}C_{2. i have no idea how to do this i got it for homework despite the fact that we never did it in class. } - Mar 22nd 2013, 05:20 PMPlatoRe: probability
- Mar 23rd 2013, 03:40 AMamyl95Re: probability
ya then i get n=-20 or n=21, so that must mean that n=21 if it in the question it states that n ≥ 2. thanks but i just don't get where you got n(n-1)/2 ?

- Mar 23rd 2013, 04:28 AMMINOANMANRe: probability
Amy 195

Pls study the formula of combinations. the formula that gives you how many combinations you will get if you have n -distict objects and you combine them by 2 is the one that Plato gave you...