railway DMRC CRA Mock Test Series Quantitative Aptitude Number System Integers

Given that \(1 + 2 + 3 + \ldots + N = \frac{{N\left( {N + 1} \right)}}{2}\) then 1 + 3 + 5 + ….. + 99 is equal to

1
2250
2
2500
3
2525
4
3775
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