defence exam Army Havildar SAC Mock Test Series 2025 Mathematics Sequences and Series Special Series
Find sum of \(\rm \frac{1}{{1 \times 2}} + \frac{1}{{2 \times 3}} + \frac{1}{{3 \times 4}} +...+\frac{1}{{n \times (n+1)}} \)
1
n(n + 1)
2
\(\rm \frac {n}{n+1}\)
3
\(\rm \frac {2n}{n+1}\)
4
None of these