2/6/2016 08:20:16 am
Great exercise. Thanks Paul !
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2/6/2016 08:47:15 am
15 boys. Used a probability tree with b for boys and g for girls, formed an equation then solved. Lovely question for GCSE higher pupils to test knowledge of probability and algebra simultaneously. Reminds me of the controversial 'sweet' question from last year's GCSE.
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2/6/2016 09:39:34 am
Agree with Paul. The puzzle has similarities to the infamous Hannah's sweets question. .
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Ahmad
3/6/2016 01:19:20 am
let n is the number of all students, so,
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Paul
3/6/2016 07:48:08 am
As always, loving your comments, guys. Do keep them coming.
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tom
5/6/2016 06:48:00 pm
If n is the number of boys, 10C2/(10+n)C2 = 0.15; so (10+n)C2 is 10C2/0.15 = 45/1.5 = 300 = 25C2 so n+10 is 25.
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raluca
5/7/2016 10:12:05 am
NO.will ahve in total only 40
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