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Convergence articles

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A portrait gallery of mathematicians, mostly taken from the collection at the Dibner Library of the Smithsonian, with permission.
Suppose that the propability of success in an experiment is 1/10. How many trials of the experiment are necessary to insure even odds on it happening at least once?
A barrel has various holes in it. The fist hole empties the barrel in three days...
A man agreed to pay for 13 valuable houses worth $5000 each, what the last would amount to, reckoning 7 cents for the first, 4 times 7 cents for the second, and so on, increasing the price 4 times on each to the last.
Find two numbers, x and y, such that their sum is 10 and x/y + y/x = 25
A brief outline of policies for submission of articles to Loci.
In how many ways can a vowel and a consonant be chosen out of the word "logarithms?"
Posters illustrating mathematics concepts in such places as China, Japan, India, and the Americas.
The author became fascinated with the mysterious role of √-1 in electronics. Turning to history for insight, he brings the perspectives of both a practical man and a scholar in conveying the enchantment of mathematics for a non-mathematician.
A square walled city measures 10 li on each side. At the center of each side is a gate. Two persons start walking from the center of the city.

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