There are ‘e’ students in a school studying English and ‘a’ students studying Arabic. How many students study English and Arabic or both if ‘b’’ students study both?
Solution
Correct Answer: Option C
To understand why, we can use the principle of inclusion-exclusion.
The total number of students is e + a because there are e students studying English and a students studying Arabic, and we don't want to count any student twice.
However, we need to subtract the number of students who are counted twice, which is the number of students studying both English and Arabic, denoted by b.
So, the number of students studying English and Arabic or both is:
e + a - b
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