A algorithmic challenge of Rolling Dice and Combinatorics !!

Anyone can provide me a solution of this problem:

There are 20(N) dices with 12(F) faces.If all of them are rolled together ,find the no of the combinations for which the value of sum of top (higher) 10(T) dices is equal to 70(V).

Example:(for N=5,F=6,T=2)

Combination     top 2 value     sum of top 2 value

1,2,4,2,5    4,5    9

6,4,2,4,1    6,4     10