In a football championship, 153 matches were played. Every team played one match with each other. The number of teams participating in the championship is
A. | 17 |
B. | 18 |
C. | 9 |
D. | none of these |
Option: B Explanation : |
Three persons enter a railway compartment. If there are 5 seats vacant, in how many ways can they take these seats?
A. | 60 |
B. | 20 |
C. | 15 |
D. | 125 |
Option: A Explanation : |
Number n of license plates that can be made where each plate contains two distinct letters followed by three different digits is
A. | 486000 |
B. | 468000 |
C. | 498000 |
D. | 489000 |
Option: B Explanation :
n = 26 x 25 x 10 x 9 x 8 = 468000. |