@arthurcdent i'm not sure if the question is rhetorical or real 😬, anyway, getting all heads is 1/2 * 1/2 = 0.25 in the 2 flips scenario, and (1/2)^20 for the 20 flips. assuming a . similarly we can calculate for half flips heads, 2choose1 / 2*2 which is 0.5 for 2 flips and ...