need help with a question --- two possible answers

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jl2684: Junior | Next Rank: 30 Posts; Posts: 15; Joined: Tue Mar 23, 2010 4:28 pm; Thanked: 1 times

by jl2684 » Mon May 17, 2010 8:55 am

A newly discovered painting on wooden panel by Michelangelo must have been completed after 1507 but before 1509. It cannot have been painted earlier than 1507 because one of its central figures carries a coin that was not minted until that year. It cannot have been painted after 1509 because it contains a pigment that Michelangelo is known to have abandoned when a cheaper alternative became available in that year.

Which of the following is an assumption on which the argument depends?

1)No stocks of the abandoned pigment existed after 1509.
2)Michelangelo did not work on the painting over the course of several years.
3)...
4)...
5)...

What's your pick between 1) and 2)? I'm having trouble with the official explanation provided. Help, please!

Source: Beat The GMAT — Critical Reasoning | Mon May 17, 2010 8:55 am

this_time_i_will: Master | Next Rank: 500 Posts; Posts: 268; Joined: Wed Mar 17, 2010 2:32 am; Thanked: 17 times

by this_time_i_will » Mon May 17, 2010 9:41 am

I think it is easy to rule out 1.
If we negate 1, it means stocks of abandoned pigment (costlier) were available after 1509. Still the conlucion that the painting was done between 1507-1509 holds tight. Miachelangelo simply did not use the pigment.

If we negate 2, Miachelangelo worked for several year on the painting. Then authors whole claim that it was completed in just 2 years falls like a pack of card. 2 it is.

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sk818020: Master | Next Rank: 500 Posts; Posts: 214; Joined: Mon Mar 29, 2010 1:46 pm; Location: Houston, TX; Thanked: 37 times; GMAT Score:700

by sk818020 » Mon May 17, 2010 9:46 am

The answer is B

Here is a good discussion of why https://www.beatthegmat.com/find-the-ass ... 25226.html.

Hope this helps.

Thanks,

Jared

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