Here's the general equation to find the probability that at least x out of y n-sided dice have the same face. https://www.wolframalpha.com/input?i=calculate+%5Csum_%7Bi+%3D+x%7D%5Ey+%28n+%5Cbinom%7By%7D%7Bi%7D+%281%2Fn%29%5Ei+%28%28n-1%29%2Fn%29%5E%7By-i%7D%29+when+x+%3D+3%2C+y%3D+5%2C+n+%3D+6
HOLY SHIT I never thought anyone would care to do that thank you a lot! I'll definitely use your equasion while still testing my card game, you're awesome!
In other words (to paraphrase the pun), you know enough Spanish to be dangerous (to yourself). However, take heart in knowing that you at least know enough Spanish at all as opposed to others who don't. Also, it just means that you should speak Spanish more, not less. Don't be discouraged.
I've got a new post showing the updated solution to @bruno-rubim 's probability challenge - come check it out!