TCS
Company
Numerical Ability
Age Problem
What is∑
(
), where
is the number of ways of choosing k items from 28
items?
a. 406 *
b. 306 *
c. 28 *
d. 56 *
Read Solution (Total 6)
-
- sum of all terms till 28
= n(n+1)/2
=28*29/2
=406 - 10 years agoHelpfull: Yes(15) No(1)
- sum of all terms from 1 t0 28 gives 406
- 10 years agoHelpfull: Yes(2) No(0)
- ANS-406*
formula=1/2(n*(n-1))*2^(n-1) - 10 years agoHelpfull: Yes(1) No(1)
- the number of ways choosing k item from 28 is 28 * k!ways we can choose
- 10 years agoHelpfull: Yes(1) No(0)
- n(n+1)/2
n=28 n+1=29
answer
28*29=812
812/2=406 - 10 years agoHelpfull: Yes(0) No(0)
- n(n+1)/2
n=28 n+1=29
answer
28*29=812
812/2=406 - 10 years agoHelpfull: Yes(0) No(0)
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