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Find the value of (S_{81}+S_{108}-S_{54}).
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Answer and explanation
Correct answer: (7722)
(S_{81}=3321), (S_{108}=5886), and (S_{54}=1485), so the value is (7722). In mixed sums, write each (S_n) separately.
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What is the correct answer to this question?
(7722)
Why is this the correct answer?
(S_{81}=3321), (S_{108}=5886), and (S_{54}=1485), so the value is (7722). In mixed sums, write each (S_n) separately.
Which subject and chapter does this question cover?
This is a Class 9 Mathematics question. Chapter: Sequences and Progressions. Topic: Sum of first n natural numbers.
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