CAT 1995 — QA Question 21
BasicsEasy
If a 4 digit number is formed with digits 1, 2, 3 and 5. What is the probability that the number is divisible by 25, if repetition of digits is not allowed?
Answer & solution
Correct answer: 1 12
- B
- C
- D
None of these
Solution
Total number of four-digit numbers that can be formed = 4!.
If the number is divisible by 25, then the last two digits are 25.
So the first two digits can be arranged in 2! ways.
Hence, required probability =