In the above problem, if the first digit cannot be 0, then
A. | 42100 |
B. | 421200 |
C. | 42400 |
D. | 421600 |
Option: B Explanation : n=26x 25x 9x 9x 8=421200. Click on Discuss to view users comments. |
In how many ways can 10 people be seated in a row so that a given pair is not next to each other?
A. | 10 ! - 9 ! |
B. | 10! - 2(9!) |
C. | 9! |
D. | none of these |
Option: B Explanation : Click on Discuss to view users comments. |
The number of ways to cut a six sided convex polygon whose vertices are labeled into four triangles using diagonal lines that do not cross is
A. | 13 |
B. | 14 |
C. | 12 |
D. | 11 |
Option: C Explanation : Click on Discuss to view users comments. |
Suppose a licence plate contains two letters followed by three digits with the first digit not zero. How many different licence plates can be printed?
A. | 608000 |
B. | 608200 |
C. | 608400 |
D. | 608600 |
Option: C Explanation :
Each letter can be printed in twenty-six different ways, the first digit in nine ways and each of the other two digits in ten ways. Click on Discuss to view users comments. |