A biased coin has probability p p\,p of landing heads. It is tossed twice independently. Given that at least one head is obtained, the probability that both tosses are heads is 49\displaystyle \frac4994.
Find ppp.
164 exam-style questions on WJEC A Level Maths 4.1 Probability (A-level only), covering 4.1.1 Probability (A-level only), 4.1.2 Probability (A-level only), and 4.1.3 Probability (A-level only). Each one has a worked solution and a mark scheme showing where the marks go.