Elena enters a lucky dip contest.
There are 150 entries in total. Only one entry will be chosen to win the main prize. Each entry has an equal chance of being chosen.
Write down the probability that Elena's entry will win the prize.
Write down the probability that Elena's entry will not win the prize.
236 exam-style questions on OCR GCSE Maths Probability. Each one has a worked solution and a mark scheme showing where the marks go.