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GMAT Question of the Day (September 8)

Jeff 0

Math

If a and b are positive integers (a \gt b), is a^2 - b^2 divisible by 4?
(1) a = b + 2

(2) a and b are odd

Question Discussion & Explanation
Correct Answer - D - (click and drag your mouse to see the answer)

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Verbal

In the years since the city of London imposed strict air-pollution regulations on local industry, the number of bird species seen in and around London has increased dramatically. Similar air-pollution rules should be imposed in other major cities.
Each of the following is an assumption made in the argument above EXCEPT:
(A) In most major cities, air-pollution problems are caused almost entirely by local industry.
(B) Air-pollution regulations on industry have a significant impact on the quality of the air.
(C) The air-pollution problems of other major cities are basically similar to those once suffered by London.
(D) An increase in the number of bird species in and around a city is desirable.
(E) The increased sightings of bird species in and around London reflect an actual increase in the number of species in the area.

Question Discussion & Explanation

Correct Answer - A - (click and drag your mouse to see the answer)

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