What is∑
(
), where
is the number of ways of choosing k items from 28
items?
a. 406 *
b. 306 *
c. 28 *
d. 56 *

• sum of all terms till 28
  = n(n+1)/2
  =28*29/2
  =406
• 11 years agoHelpfull: Yes(15) No(1)
• sum of all terms from 1 t0 28 gives 406
• 11 years agoHelpfull: Yes(2) No(0)
• ANS-406*
  formula=1/2(n*(n-1))*2^(n-1)
• 11 years agoHelpfull: Yes(1) No(1)
• the number of ways choosing k item from 28 is 28 * k!ways we can choose
• 11 years agoHelpfull: Yes(1) No(0)
• n(n+1)/2
  n=28 n+1=29
  answer
  28*29=812
  812/2=406
• 11 years agoHelpfull: Yes(0) No(0)
• n(n+1)/2
  n=28 n+1=29
  answer
  28*29=812
  812/2=406
• 11 years agoHelpfull: Yes(0) No(0)