Sorry if that’s unclear. The range is the range of numbers you and the GM are choosing from on your fingers. So if the check is mild, you’re both choosing 1 or 2 fingers and revealing. If you chose the same number as the GM, you succeed.
oh, so it's how many fingers, not what fingers lol.
so it's 1/n chance to match for people who's fingers are as random as dice. i'm new to probability math and it's riveting.
i instantly thought of a tiny glass jar with 2d4, 2d6 and 2d10 to mimic same chances to match