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[转帖]2.26 JJ (AWA and few )

AA: The following appeared as part of an article in a weekly newsmagazine

"The country of Sacchar can best solve its current trade deficit problem by lowering the price of sugar, its primary export. Such an action would make Sacchar better able to compete for markets with other sugar-exporting countries. The sale of Sacchar's sugar abroad would increase, and this increase would substantially reduce Sacchar's trade deficit."

AI: Technology actually separates or alienates people instead of bringing them together.

Maths

1.On the xy-plane, which quardrant will the below line NOT pass through.

Y={(x-2)^2} -1

2. There are 100 balls. 5 are defective. 1 ball is first selected without replacing. What is the probability that 2 consecutive balls are NOT defective.

Key:95/100 * 94/99

3. Figure provided. 4 big circles are placed within 1 big squre. The sides of the circles are tangent to the sides of the square. 1 small circle is placed at the centre of the square so that the sides of the small circle are tangent to the sides of the 4 big circles. (Hope this is clear enough.)

Question: What is the ratio of the radius of the small circle to the length of the square.

Reading Comprehension

1. As previously mentioned JJ on Sea serpant or sea blobster

2. Adam Smith's economical theroy about "Truck, barter,exchange".

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