Interesting Fact - GCSE Maths #EdexcelMaths
The Twitter hashtag #EdexcelMaths popped up all over the internet following the GCSE maths exam paper from Edexcel (part of the Pearson group). It contained a question about someone called Hannah and her bag of orange and yellow sweets, and caused a hilarious Twitter storm. (Tweets like this:- flooded the net over the following question:- Hannah has 6 orange sweets and some yellow sweets. Overall, she has n sweets. The probability of her taking 2 orange sweets is 1/3. Prove that: n^2-n-90=0 According to the Independent, this is the answer:- There are 6 orange sweets and n sweets overall. So, if Hannah takes one, there is 6/n chance of getting an orange sweet. When she takes one,, there is one less orange sweet and one less overall meaning that the probability is now (6-1)/(n-1)=5/n-1. To find the probability of getting the orange sweet both times, multiply the two fractions: 6/n* 5/n-1 =30/n^2-n. It shows the probability of taking two orange sweets (1/3) i...