railway RRB JE (CBT I + CBT II) Mock Test 2024 Quantitative Aptitude Elementary Statistics

প্রথম 'n'টি স্বাভাবিক সংখ্যার আদর্শ বিচ্যুতি নির্ণয় করুন।

1
\(\sqrt{\frac{n^2-1}{12}}\)
2
\(\frac{n(2 n+1)}{3}\)
3
\(\frac{n(n+1)}{12}\)
4
\(\sqrt{\frac{n^2+1}{6}}\)
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