$$(1,1), (1,2), (1,3), (1,4), (1,5), (1,6)$$
$$(2,1), (2,2), (2,3), (2,4), (2,5), (2,6)$$
$$(3,1), (3,2), (3,3), (3,4), (3,5), (3,6)$$
$$(4,1), (4,2), (4,3), (4,4), (4,5), (4,6)$$
$$(5,1), (5,2), (5,3), (5,4), (5,5), (5,6)$$
$$(6,1), (6,2), (6,3), (6,4), (6,5), (6,6)$$
Total outcomes $$=36$$
Sum is $$8$$
Favourable outcomes $$=(2,6), (3,5), (4,4), (5,3), (6,2)=5$$
$$P$$ (sum is $$8$$) $$=\dfrac{5}{36}$$