Currency refund problem

1. Complement: (1, 2 stands for opposite side)

The probability of the test ending before throwing 6 times, that is, 1- 6 times without ending (no expected result).

The first six times were not completed:1212 or 2 12 12 1.

The probability is 2/(2 * 2 * 2 * 2 * 2) = 1/32.

So the probability of ending before six times:1-1/32 = 31/32.