# Combinatronics JEE

All four digit numbers of the form $$\overline{x_1 x_2 x_3 x_4}$$ form by using the digits 1 to 9 such that $$x_1 \leq x_2 \leq x_3 \leq x_4$$ and are list in ascending order (smallest to biggest).

If the number with rank 460 is of the form $$\overline{abcd}$$, find $$\frac {a+b+c+d}{4} - 2$$.

×