Maths problem.
Earlier this week this question was in the Edexcel Maths GCSE paper:
There are n sweets in a bag. 6 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.
A students response to this on Twitter was:-
"Hannah eats some sweets" OK "Calculate the circumference of the moon using your tracing paper and a rusty spoon"
Kind of restored my faith in today's young students.