dice_1 = [1, 2, 3, 4, 5, 6]
dice_2 = dice_1.copy()

diff_and_sum_to_6 = 0
all_outcomes = 0
for v1 in dice_1:
    for v2 in dice_2:
        all_outcomes += 1
        if (v1 != v2) and (v1 + v2 == 6):
            diff_and_sum_to_6 += 1

prob_diff_and_sum_to_6 = diff_and_sum_to_6 / all_outcomes
print(prob_diff_and_sum_to_6)