यदि किसी A.P. के प्रथम \( n \) पदों का योग \( 4 n-n^{2} \) है, तो इसका प्रथम पद (अर्थात् \( S_{1...

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यदि किसी A.P. के प्रथम \( n \) पदों का योग \( 4 n-n^{2} \) है, तो इसका प्रथम पद (अर्थात् \( S_{1} \) ) क्या है? प्रथम दो पदों का योग क्या है? दूसरा पद क्या है? इसी प्रकार, तीसरे, 10 वें और \( n \) वें पद ज्ञात कीजिए।
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