Question 301724
The first number needs to be a 4 so that the number is > 400.
That leaves 3 numbers (1,2,3) for 2 positions.
{{{N=3!/(3-2)!=6}}} numbers
or by brute force,
{{{ 412 }}}
{{{ 413}}}
{{{ 421}}}
{{{ 423}}}
{{{ 431}}}
{{{ 432}}}
6 numbers.