A jar contains 3 apple-flavored sweets and n n\,n orange-flavored sweets.
Two sweets are chosen at random from the jar without replacement.
The probability that both sweets chosen are apple-flavored is 115\displaystyle \frac{1}{15}151.
Work out the value of nnn.
43 exam-style questions on OCR GCSE Maths Probability Equation Questions. Each one has a worked solution and a mark scheme showing where the marks go.