Elitmus
Exam
Numerical Ability
Permutation and Combination
Asked in Bangalore Elitmus 29/10/2017
find the number of ways you can fill a 3*3 grid with 4 corners define a (a,b,c,d) if you have 3 white marbles and 6 black marbles.
Answer is: 9c3
Read Solution (Total 2)
-
- total way to fill this grid is =9!
3 white marble
6 black marble
so
total way=9!/3!*6!=9c3 - 6 years agoHelpfull: Yes(12) No(0)
- 9c3=81:and 9c6 = 84 so if we arrange 2 white marbles first then 9c3 so there is no need for any other arrangement of black marbles bcz ans is same .
- 6 years agoHelpfull: Yes(0) No(1)
Elitmus Other Question
Asked in Bangalore Elitmus Test (29/10/2017)
A can do a piece of work in a days, B can do a piece of work in b days, C can do a piece of work in c days.If A+B can do a piece of work in 6 days B+C can do a piece of work in 7.5 days, C+A can do a piece of work in 10 days find the increasing order of a,b,c.
Find the value of h[f(1,2,3), g(2,1,-2), h(1,-1,-1)]
a. 0.5 b. none c. 1 d. 0