QA – Placement Quizzes | Progressions | Question 12

log1010 + log10102 + … + log1010n
(A) n2 + 1
(B) n2 – 1
(C) [(n2 + n)/2] * [(n(n+1))/3]
(D) (n2 + n)/2


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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