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all 4 movies are shown from 4th through 18th week
and in this range (solid black square) movie O was never at the bottom position(least rank or minimum sales) and never at the top position(top rank or maximum sales)
hence correct choices 1,1
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We only look at the weeks when all four movies appear on the graph at the same time: All four movies appear together from Week 4 through Week 18.

Reason
For each of the weeks that all 4 movies were shown in theaters, exactly <<Select>> never had the least ticket sales among the 4 movies, and exactly <<Select>> of the 4 movies never had the greatest ticket sales among the 4 movies.
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why we are checking from week 4 and not from week 1 ?
Bunuel


For 22 consecutive weeks (Weeks 1-22) of last year, the graph gives weekly ticket sales rankings for each of 4 movies (Movies M-P) when compared to all movies shown in theaters that week. Lower-numbered rankings indicate greater sales. If no data are given for a movie during a given week, the movie either was not yet or was no longer being shown in theaters. None of the 4 movies were shown in theaters during any week other than Weeks 1-22.

Select the options from the drop-down menus that create the most accurate statement based on the information provided.

For each of the weeks that all 4 movies were shown in theaters, exactly 1 never had the least ticket sales among the 4 movies, and exactly 1 of the 4 movies never had the greatest ticket sales among the 4 movies.


• The graph shows the weekly ticket sales ranking for four movies, M, N, O, and P, from Week 1 to Week 22.
• On the vertical axis are rankings.
• A smaller ranking number (closer to the top of the graph) means higher ticket sales.
• A larger ranking number (lower on the graph) means lower ticket sales.
• If a movie has no point in a week, it was not shown that week.
We only look at the weeks when all four movies appear on the graph at the same time: All four movies appear together from Week 4 through Week 18.

• First drop down

“Least ticket sales” means the movie with the worst rank among the four in that week. On the graph, that is the movie whose point is lowest. We check which movies were never the lowest among the four in Weeks 4-18:

Movie O (the one with the solid black squares) is never the lowest on the graph. The solid black square is never below the symbols of the other three movies.

So exactly 1 movie (Movie O) never had the least ticket sales.

• Second drop down

“Greatest ticket sales” means the movie with the best rank among the four in that week. On the graph, that is the movie whose point is highest (smallest ranking number). We check which movies were never the highest among the four.

Again, Movie O (the one with the solid black squares) is never the highest. The solid black square is never above the symbols of the other three movies.

So exactly 1 movie (Movie O) never had the greatest ticket sales.
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why we are checking from week 4 and not from week 1 ?


This is explained in the solution you quote.

We only check the weeks when all 4 movies were shown, because the question asks: “For each of the weeks that all 4 movies were shown in theaters...”

In Weeks 1-3, not all four movies have rankings, so those weeks are excluded. The comparison starts from Week 4, when all four movies have data.
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