QA – Placement Quizzes | Progressions | Question 12
log1010 + log10102 + … + log1010n
(A) 
(B) 
(C) ![\[(n^2+ n)/2] * [(n(n+1))/3]](https://www.geeksforgeeks.org/wp-content/ql-cache/quicklatex.com-9e2e275834991cd73a9de31ac3949b23_l3.png "Rendered by QuickLaTeX.com")
(D) 
Answer: (D)
Explanation: Rewriting the expression as
1 + 2 + … + n
We know, sum of n natural numbers is given by n*(n+1)/2 = (n2+n)/2
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