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A contractor undertakes to do a job within 100 days and hires 10 people to do it. After 20 days he realizes that one fourth of the work is done so he fires 2 people. In how many more days will the work get over

In how many ways can 9 red balls and 10 yellow balls be arranged in a queue such that it looks identical from left to right or right to left?

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Questions are bilingual. 

Questions are bilingual. 

My Question is, why did they considered the shaded region as the whole First quadrant (with y axis as well) and not the intersection of those two lines: -x+y=3 and x+y=6

My Question is, why did they considered the shaded region as the whole First quadrant (with y axis as well) and not the intersection of those two lines: -x+y=3 and x+y=6

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some A are B, some B are C, All C are D.

conclusion:

some A are not D. I am unsure whether this conclusion is false.

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