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If (S_u=1225) and (S_v=2628), what is the value of (u+v)?
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Answer and explanation
Correct answer: (121)
(S_{49}=1225) and (S_{72}=2628), so (u+v=121). First identify the indices of both triangular numbers.
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What is the correct answer to this question?
(121)
Why is this the correct answer?
(S_{49}=1225) and (S_{72}=2628), so (u+v=121). First identify the indices of both triangular numbers.
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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