(a(i))[2]
George says: I am more likely to take a black ball from bag 2 than from bag 1. Show that he is correct.
(a(ii))[2]
George chooses a ball at random from Bag 2, records its colour and then replaces it. He repeats this $220$ times. How many times would he expect to choose a white ball?
(b(i))[2]
A bag contains $7$ blue counters, $6$ red counters and $3$ green counters. Yasmin takes two counters at random without replacement. Complete the tree diagram.
(b(ii))[3]
Find the probability that at least one of the counters is red.