IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE AS & A2 Level => Math => Topic started by: astarmathsandphysics on September 25, 2009, 06:14:15 pm

Title: Binomial questions
Post by: astarmathsandphysics on September 25, 2009, 06:14:15 pm: ⁿC₂/ⁿC₃= $\frac {n!}{2!(n-2)!}$ / $\frac {n!}{3!(n-3)!}$

= $\frac {3!(n-3)!}{2!(n-2)!}=\frac {3*2!}{2!}* \frac {(n-3)!}{(n-2)!} =3* \frac {(n-3)!}{(n-2)(n-3)!}=3/(n-2)$
Title: Re: Binomial questions
Post by: Ghost Of Highbury on September 25, 2009, 06:18:02 pm: awesome..thanks a lot sir...!!!
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Title: Re: Binomial questions
Post by: astarmathsandphysics on September 26, 2009, 08:05:58 am: See also

http://www.astarmathsandphysics.com/a_level_maths_notes/C2/a_level_maths_notes_c2_binomial_expansion.html
Title: Re: Binomial questions
Post by: Ghost Of Highbury on September 26, 2009, 08:18:44 am: thanks