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Sanna watched at least one movie each day during her autumn break which lasted for 6 days. If Sanna did not watch any movie more than once, was the total number of movies that Sanna watched over her autumn break greater than 20?

(1) Sanna watched fewer than 7 movies on each of the 6 days.
(2) Sanna watched a different number of movies on any two of the 6 days.

Explanation:

The total number of days = 6
The number of movies watched each day is at least 1.
We need to find whether the total number of movies watched is greater than 20.

Statement (1)

Sanna watched fewer than 7 movies on each of the 6 days.

Possibility 1: If Sanna watched 1 movie each day, then the total number of movies watched = 6 x 1 = 6 < 20.
Possibility 2: If Sanna watched 6 movies each day, then the total number of movies watched = 6 x 6 = 36 > 20.

It is NOT possible to determine whether the total number of movies watched is greater than 20. Hence, Statement (1) is insufficient.

Statement (2)

Sanna watched a different number of movies on any two of the 6 days.

Minimum possible number of movies watched = 1 + 2 + 3 + 4 + 5 + 6 = 21 > 20.

It is possible to determine that the total number of movies watched is greater than 20. Hence, Statement (2) is sufficient.

B is the correct answer choice.
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