Member since February 24, 2005

crichey

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crichey
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Thu 24 Feb, 2005 10:37 am - Find the sum S=1+2+3+...+1000 Hint: Use a formula or note sum S=1000+999+998+...+3+2+1 (view)
Thu 24 Feb, 2005 10:34 am - Twenty students gather around an empty hat. Each puts a slip of paper with her student ID number on it into the hat. They each randomly select one slip from the hat. What is the probability that... (view)
 
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