A-Level Maths: M1-11 [Probability: Picking Three at Random Problem]

[ellalounds]

wow thank you so much for this, I've had such a mental block with probabilities and this + your explanation of independent events really cleared it up -- i remember doing a question like this about 2 years ago and doing each branch separately (i think there were six events!) and it took me ages, but this just helped it click at last, thank you

[shmeef]

2:29 the sarcastic "that.... lovely looking fraction there" got me lol

[brooke-ztrq]

never understood it until now, lifesaver

[VirlTks]

is it possible if I were to find the probability of AAA+BBB+CCC and then 1-total of the three

[z_]

Hi Sir, I was just wondering for part a), how do we know that its without replacement? I was under the assumption that I could just do (70/210)^3

[harrysmith]

Does using nPr work instead to calculate the number of different outcomes you could get for the different orders?

[samanthacrawford]

I’ve done questions before where you don’t multiply by how many different outcomes there could be, in what scenarios would this be the case? Thanks very much!