A math question.
A math test that was set by the British education and examination board Edexcel.
-
There are n sweets in a bag. Six of the sweets are orange. The rest of the sweets are yellow. Hannah takes a random sweet from the bag. She eats the sweet. Hannah then takes at random another sweet from the bag. She eats the sweet. The probability that Hannah eats two orange sweets is 1/3. Show that n²-n-90=0.
-
Professor Ian Dryden, the head of mathematical sciences at the University of Nottingham has solved is test and here is how he did it.
Join the Discussion