What is k=0 to 28 k^2 (28Ck), where 28Ck is the number of ways of choosing k items from 28 items?
a) 406*2^27
b) 306*2^26
c) 28*2^27
d) 56*2^27

• Its a formula n(n+1)2^(n-2) = 28*29*2^26 = 406*2^27
• 11 years agoHelpfull: Yes(24) No(1)
• @ SRIRAM KUMAR MANNAVA
  IN THE FORMULA n(n+1)2^(n-2)
  U HAVE TAKEN n=28 THE n-2=26 NOT 27
  U HAVE STATED IT AS 27
• 11 years agoHelpfull: Yes(6) No(9)
• ans;- 28*2^27
• 11 years agoHelpfull: Yes(0) No(4)
• (n^2 + n)2^(n-2) this is the required formula for given summation
  
  
  here n=28
  
• 11 years agoHelpfull: Yes(0) No(1)
• post one exact formula with solution please
• 10 years agoHelpfull: Yes(0) No(0)
• n(n+2)*2^(n-2)=28*29*2^26=812*2^26=406*2^27
• 9 years agoHelpfull: Yes(0) No(0)
• all the given solutions are the same..just presented in different form
• 9 years agoHelpfull: Yes(0) No(0)