Teaching Rajasthan 3rd Grade REET Mains (Level I & II) Mock Test Mathematics Sequences and Series Arithmetic Progressions

यदि एक समांतर श्रेढ़ी में, a = 1, an = 20 और Sn = 399 है, तब n क्या है।

1
19
2
21
3
38
4
42
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