A five-digit number is chosen at random from all possible five-digit numbers. Find the probability that the number is NOT divisible by every element of ( 1,2,3,4,5)
What are the prime factors here
2,3,5, but we need another 2 to make 4
10000 / 60 =166 and a bit
so the smallest that is a multiple of 60 is 60*167
99999/60=1666 and a bit
so the biggest that is a multiple of 60 is 60*1666
1666-167+1 = 1500
There are 1500 numbrs that are divisable by all of those numbers.
Now, you tell me, what do you do next?
Please other answerers, let the asker answer this.