Q. The number of numbers of 4 digits which are not divisible by 5, are
A) 7200
B) 3600
C) 14400
D) 1800
Explanation
(a)
Total number of four digit numbers $= 9 \times 10 \times 10 \times 10$
$= 9000$
Total number of four digit numbers which divisible by 5
$= 9 \times 10 \times 10 \times 2 = 1800$
$\therefore$ Required number of ways $= 9000 - 1800 = 7200$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.