If each of the students in a certain mathematics class is either a junior or a senior, how many students are in the class?

(1)   If one student is to be chosen at random from the class to attend a conference, the probability that the student chosen will be a senior is 4/7.
(2)   There are 5 more seniors in the class than juniors.


Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient.

Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient.

BOTH statements TOGETHER are sufficient, but NEITHER statement ALONE is sufficient.

EACH statement ALONE is sufficient.

Statements (1) and (2) TOGETHER are NOT sufficient.

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