In a school of 300 students, 110 offered French, 110 Hausa language, 180 history, 40 French and Hausa, 50 Hausa and history, 60,
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ANSWER
EXPLANATION
The sum of an arithmetic sequence whose first term and last terms are known is calculated using
From the given information, the first term of the series is
and the last term of the series is
The sum of the first 26 terms is