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Bunuel
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I think we need more clarity on the question stem. Assuming all students take at least one of F or S and students do not have the option of taking neither, then answer will be C. However, assuming there is a third option (like a student may take Italian, for example) or even just that a student can take neither Spanish or French, then it's E.

But I think the question stem doesn't tell us which assumption is accurate.
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Bunuel
How many of the students at Andre DoValle High School are taking French?

(1) There are 1,200 students attending Andre DoValle High School.
(2) The are 600 students taking Spanish and 400 students taking both French and Spanish at the Andre DoValle High School.


­
We need to find the number of students at Andre Dovalle High School who are taking French.

Let’s consider the two set venn diagram



Statement 1:

(1) There are 1,200 students attending Andre DoValle High School.

There were a total of 1200 students who are attending the school. We don’t know exactly how many attend taking French or Spanish.

Hence, insufficient.

Statement 2:

(2) The are 600 students taking Spanish and 400 students taking both French and Spanish at the Andre DoValle High School.


b+ c = 600 students

b = 400 students.

c = 200.

Since, we cannot find the value of a ( French alone ).

Hence, Insufficient

Combining, both statements 1 and 2, we get

a+b+c+d = 1200

b+c = 600

therefore, a+d = 600

a and d can take any values.

Hence, Insufficient

Option E.

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