Given, a four-digit number is formed with the digits 1, 2, 3, 5 with no repetitions. There are as many numbers as there are ways of filling in 4 vacant places.
The no. of ways in which the 4 places can be filled, by multiplication principle, is ways
For the Numbers divisible by 5,
the 4th place can be only filled by 1 way i.e., by 5, the 1st place can be filled by 3 ways (since repetition is not allowed), the second place by 2 ways and the third by 1 way.
total numbers divisible by
P (no. divisible by 5)
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