1 / 2 = 1-2 / 1, 1 / 6 = 1 / 2-3 / 1, 1 / 12 = 1 / 3-4 / 1... According to the above rules, calculate the following question: 1 / 2 + 1 / 6 +1 in 12 + 1 in 20 + 1 in 30

1 / 2 = 1-2 / 1, 1 / 6 = 1 / 2-3 / 1, 1 / 12 = 1 / 3-4 / 1... According to the above rules, calculate the following question: 1 / 2 + 1 / 6 +1 in 12 + 1 in 20 + 1 in 30

=1-2:1 + 2:1-3:1 + 3:1-4:1 + 4:1-5:1 + 5:1-6:1
=1-1 / 6
=5 out of 6