IBM
Company
Numerical Ability
Permutation and Combination
A father of 6 children takes 2 of his children at a time to a circus as often as he can, without taking the same pair of children together more than once. How many times does the father go to the circus?
Read Solution (Total 5)
-
- suppose the children are A B C D E F
then AB AC AD AE AF (5 times for A)
then BC BD BE BF (4 times for B)
SIMILARLY 3 times for C, 2 for D, 1 for E,0 for F so 5+4+3+2+1+0=15 - 11 years agoHelpfull: Yes(53) No(3)
- He has to choose 2 children from 6
total number of combinations=6c2=15
Father goes to circus 15 times - 10 years agoHelpfull: Yes(34) No(4)
- it is simple 6 p 2=15 i.e permutation
- 7 years agoHelpfull: Yes(0) No(7)
- suppose the children are A B C D E F
then AB AC AD AE AF (5 times for A)
then BC BD BE BF (4 times for B)
SIMILARLY 3 times for C, 2 for D so 5+4+3+2=14 - 7 years agoHelpfull: Yes(0) No(0)
- At a time his father took 2 children out of 4 so
no of times his father goes to the circus=
6c2=15 - 4 years agoHelpfull: Yes(0) No(0)
IBM Other Question
A set of 7 pens, 9 erasers and 11 sharpeners costs Rs 79 and 2 pens, 5 erasers and 8 sharpeners cost Rs 42. Find the total cost of one sharpeners, one eraser and one pen.
asked in 1 FEB 2013 Bangalore IBM drive
1)3,7,10,8,4,12,0,5,5,3,2,5
2)0,1,1,2,0,5,2,2,4,2,2,4,3,7,2
3)10,12,-36,-7,-5,15,19,21
4)4,2,4,8,6,8,16
5)11.5,17.5,35.5,89.5
6)1,1,1,2,4,12,36
7)8,16,3,27,4,8,7,19,2,0,7
8)40,39,37,33,26,15
9)3,5,2,100,47,3,196,1,6,5,
10)507,169,248,62,36,12,168,42,168
11)49,7,98,16,4,48,9,3,36,23,5(here i dnt know,,it is 23 or 25 or 26)
12)8,0.5,16,4,15,0.3,50,4.5,6,0.2,30
13)115,100,86,74,65,60
14)1,3,1,2.5,5,1,4,5,4,,8,7
15)4,3,144,1.5,2,9,5,0.3,2.2
16)0,1,2,.5,2,2,2,2,4,3,2,
17)8,5,9,7,2,2.5,5,1,16,8,6,4
18)13,21,32,49,78,131...