One half, one sixth, one twelfth, one twentieth, one thirtieth The 60th number is ()

One half, one sixth, one twelfth, one twentieth, one thirtieth The 60th number is ()

1 / 2 = (1 * 2) 1 / 2
1 / 6 = (2 * 3) 1 / 6
1 / 12 = (3 * 4) 1 / 12
1 / 20 = (4 * 5) 1 / 20
1 / 30 = (5 * 6) 1 / 30
.
The 60th number is one out of (60 * 61), that is, one out of 3660