The numbers would have to end in either 6 and 4 or 4 and 6.....or......they would have to end in 8 and 2 or 2 and 8.......so, there are 4 possibilities, here
And there would be 9 of each, since the first digit could be 1 - 9....so......9 x 4 = 36
The numbers would have to end in either 6 and 4 or 4 and 6.....or......they would have to end in 8 and 2 or 2 and 8.......so, there are 4 possibilities, here
And there would be 9 of each, since the first digit could be 1 - 9....so......9 x 4 = 36
