railway DMRC CRA Mock Test Series Quantitative Aptitude Number Series

समांतर श्रेणी का nवां पद (2n - 1) है, तब इसके पहले n पदों का योग क्या होगा?

1
n2 - 1
2
(2n - 1)2
3
n2
4
n2 + 1
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