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• 52 How did pilots know when to release bombs on airplanes during World War2?
• 9 $f(550)$ if $f(11)=1$ and $f(a)f(b)=f(a+b)+f(a-b)$
• 8 How do the efforts of the Jesuits in China differ from their efforts in Japan?
• 7 Is the sum of all rational numbers between two integers infinity
• 6 How to find the limit of $\frac{\sqrt{x^2+9}-3}{x^2}$? as x approaches 0
• 6 How many 5-letter words from ABRACADABRA
• 5 how many ways of arranging given 7 two digit positive integers so that the sum of every four consecutive integer is divisible by 3?
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