Numbers - Arithmetic Aptitude Questions and Answers

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\([1- \frac { 1 } { n }]\)+\([1- \frac {2 } { n}]\)+\([1- \frac { 3 } { n } ] \)+.... up to n terms=?

\(\frac { 1 } { 2 }n\)

\(\frac { 1 } { 2 }(n-1)\)

\(\frac { 1 } { 2 }n(n-1)\)

None of these

Answer : Option B

Explanation :

....to n terms

Given sum= (1+1+1+...to n terms)-\([\frac { 1 } { n} +\)

\(\frac {2} {n}+ \)

\(\frac {3 } { n }+\)

\(n- \frac {n } { 2 } \)\([\frac { 1 } { n } +1]\)

\( n- \frac { n+1} { 2 } \)

\( \frac { 1 } { 2 } (n-1)\)

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