Mathematics · Arithmetic Progression
एक समांतर श्रेणी (AP) का पहला पद 19 है और इसके पहले 20 पदों का योग 2280 है। यदि इसके सार्व अंतर (common difference) को दोगुना कर दिया जाए, तो इसके पहले 30 पदों का योग क्या होगा?
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