167renlearncom2415095AccMatHWeupas Simplify 18 n 4n 3 n4Xn 3

167.renlearn.com/2415095/AccMatHWeupas Simplify. 18. (n +4)(n+ 3) (n+4Xn+ 3) (n +3n+ 2) (n+3) (n + 2) Back Next

Solution

18)
(n+3)! / (n+2) !
= (n+3) (n+2)! / (n+2) !
= (n+3)

Answer: C

24)
1st digit can be any one from 1 to 9. Number of possibility = 9
2nd digit can be any one from 0 to 9. Number of possibility = 10
3rd digit can be any one from 0 to 9. Number of possibility = 10
4th digit can be any one from 0 to 9. Number of possibility = 10
5th digit can be any one from 0 to 9. Number of possibility = 10

Total number of numbers = 9*10*10*10*10 = 90000
Answer: D