Let `A` be the complete solution set of the equation `[2x] = |x-1|+|x-3|`,`xlt0`. Further `B` is the complete solution set of the equation `2|x-1| =([x]([x]-1)(2[x]-1))/6 + [x]^2{x}` (Note `[x]` & `{x}` represents greatest integer less than or equal to `x` and fractional part of `x` respectively). `(1)` Number of elements in `AnnB`is? `(2)` Sum of all the elements of set `B` is