9 on apex
17, 28 or 39.
14, 25, 36, 47, 58 and 69.
between 1 and 600 inclusive there are:300 numbers divisible by 2200 numbers divisible by 3100 numbers divisible by both 2 and 3400 numbers divisible by 2 or 3.
111 numbers between 5 and 1000 are divisible by 9
There are 89 numbers between 1 and 180 that are divisible by two.
Leaving out decimal fractions, a transposition creates differences that are divisible by 9. Since 187 is not divisible by 9, a difference of 1.87 is not possible from a simple transposition.
17, 28 or 39.
14, 25, 36, 47, 58 and 69.
between 1 and 600 inclusive there are:300 numbers divisible by 2200 numbers divisible by 3100 numbers divisible by both 2 and 3400 numbers divisible by 2 or 3.
111 numbers between 5 and 1000 are divisible by 9
There are 2,966 numbers between 100 and 9,000 that are divisible by three.
Their order is switched. For example, in the two numbers 12345 and 13245, the second and third digits are transposed.
There are 98 numbers are between 1 and 100 that are divisible by five.
There are 89 numbers between 1 and 180 that are divisible by two.
There are 89,999 numbers between 100,000 and 999,999 that are divisible by 10.
There are 66 numbers between 1 and 1,000 that are divisible by 15.
There are 25 numbers between 101 and 201 that are divisible by four.