Let S(10)={1,2,3,4,5,6,7,8,9,10}

and T(10)={ number of triangles formed by using any three elements of S(10) }

in the same way

S(20) = {1,2,3,4...,18,19,20}

and T(20) ={number of triangles formed by using any three elements of S(20)}

then find the value of T(20) - T(10)