Question:
The probability that a student buys a colouring book is 0.7 and that she buys a box of colours is 0.2. The probability that she buys a colouring book, given that she buys a box of colours, is 0.3. Find the probability that the student: Buys both the colouring book and the box of colours. Buys a box of colours given that she buys the colouring book.