Mathematics · Arithmetic Progression
एक श्रेणी समांतर श्रेणी (A.P.) में है। यदि इसके प्रथम 10 पदों का योग 120 है और 10वाँ पद 21 है, तो इसके प्रथम तीन पदों का योग क्या होगा?
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