Question

if 4 digit numbers greater than than 5000 are randomly formed from the digits .0,1,3,5,7 what is the probability of forming a number divisible by 5 when
1) the digits are repeated​

Answer 1

Answer:

1. the first place can be filled by 1,3,5,7
2. second place can be filled in 5 ways by 0,1,3,5,7
3. third place can be filled in 5 ways by 0,1,3,5,7
4. fourth place can be filled in 2 ways by 0,5 since the number must be divisible by 5.