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David has a bag that holds 18 pens. 5 of the pens are ball point, 4 are gel pens and 9 are felt tip marker pens. He reaches into the bag to pull out one pen. If every pen has an equal chance of being pulled
asked
Oct 28, 2017
Mathematics
high-school
2
answers
5
votes
235k
views
What role does skin play in the excretory system
asked
May 11, 2017
Biology
high-school
2
answers
3
votes
71.6k
views
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