At a high school, students can choose between three art electives, four history electives, and five computer electives. each student can choose two electives. which expression represents the probability that a student chooses an art elective and a history elective?

Ans: Correct Option is (C) => P = 

Explanation:
According to the definition of probability:
Probability of an Event = (Number of favorable outcomes) / (Total number of possible outcomes or sample space)

or,

P = O / S;

First let us find Total number of Possible Outcomes(S):
= 12 (Since a student can choose two electives)

In mathematical terms, you can read S as:"The sample space is equals to the combination of 12 taken 2."

Number of favourable outcomes(O):
O = (3-art-electives) * (4-history-electives) 
O = (3)(4)

In mathematical terms, you can read O as:"The outcome is equal to combination of 3 taken 1 times combination of 4 taken 1."

Hence,
Probability P = O/S
P = 

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