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A challenging GCSE maths question has left students so confused and angry that they are calling on the exam board to lower its grade boundaries.
The conundrum, set by Edexcel, involves a girl called Hannah, her bag of sweets and a perplexing equation:
"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."
Some pupils were so stumped they vented their frustration on Twitter.