sign up I login
 advanced
refer a friend - earn nickels!!

Ask & Discuss Questions with Community & Experts

 Moderation Team
 90 chars left    advanced
Ask iit jee aieee pet cbse icse state board community Community Discussion Question: Complex Number
Forum Index -> Algebra like the article? email it to a friend.  
Author Message
[Post New]27 Dec 2007 13:10:27 IST
    Subject: Complex Number
[Up] View Post
sachin_gupta1991 (69)

Hot goIITian

Olaaa!! Perrrfect answer. 13  [15 rates]
sachin_gupta1991's Avatar
total posts: 140    
offline Offline
Q. Prove that [r=1 ][k ]  (-3)r-1  3nC2r-1 = 0 where k=3n/2 and n is even positive
    integer.
    
[Post New]27 Dec 2007 16:26:50 IST
    Subject: Re:Complex Number
[Up] View Post
sachin_gupta1991 (69)

Hot goIITian

Olaaa!! Perrrfect answer. 13  [15 rates]
sachin_gupta1991's Avatar
total posts: 140    
offline Offline
come on goiitians, try it.....
 this reply: 0 points  (with 0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]
 
You have to be logged on to rate
  
[Post New]27 Dec 2007 18:23:11 IST
    Subject: Re:Complex Number
[Up] View Post
nadeemoidu (1184)

Blazing goIITian

Olaaa!! Perrrfect answer. 200  [292 rates]
nadeemoidu's Avatar
total posts: 487    
offline Offline
 ( 1 + 3 i) 3n  - ( 1 - 3 i ) 3n = (2w2)3n - (2w) 3n = 2 3n - 2 3n = 0

where w is the cube root of unity.

expand  ( 1 + 3 i) 3n  - ( 1 - 3 i ) 3n  using binomial theorem , divide by 3i and u get the answer.
 this reply: 0 points  (with 0 Olaaa!! Perrrfect answer.   in 0 votes )   [?]
 
You have to be logged on to rate
  
 
Forum Index -> Algebra
Go to:   

Top Offers for goIITians
Correspondence Courses
Brilliant Tutorials
Narayana Institute
Aakash Institute
Classroom/Crash Courses
Narayana - Kota , Delhi , Others
Brilliant Tutorials - Class , Crash
Aakash Institute - Medical , Engg
Online Test Series
Brilliant Tutorials
Narayana Institute
Aakash Institute
Mahesh Tutorials
AMITY      Sri Chaitanya