Mathematics 0580 · IGCSE · Probability of combined events
Probability of combined events — practice question
A box holds 20 packets of potato chips.
6 of the packets are barbecue flavoured.
10 of the packets are salt flavoured.
4 of the packets are chicken flavoured.
(a(i))[2]
Show that the probability that she takes two packets of salt flavoured chips is $\frac{9}{38}$.
(a(ii))[4]
Find the probability that she takes two packets of different flavoured chips.
(b)[3]
Find the probability that she takes at least two packets of chicken flavoured chips.
Worked solution & mark scheme
This 9-mark question has a full step-by-step worked solution and mark scheme. One marking point: “$\frac{10}{20}\times\frac{9}{19}$” …