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 \( \frac {a+b+c+d}{4} - 2 \).

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