# QA – Placement Quizzes | Progressions | Question 12

log_{10}10 + log_{10}10^{2} + … + log_{10}10^{n}**(A)** **(B)** **(C)** **(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 = (n^{2}+n)/2

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