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in Mathematics by (25.0k points)
दर्शाइए कि `a_(1),a_(2),a_(3), . . .,a_(n), . . ` से एक स. श्रे. बनती है यदि `a_(n)` नीचे दिए अनुसार परिभाषित है :
(i) `a_(n)=3+4n` , (ii) `a_(n)=9-5n`
साथ ही प्रत्येक स्थिति में प्रथम 15 पदों का योग ज्ञात कीजिए ।

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Correct Answer - (i) `S_(15)=525` , (ii) `S_(15)=-465`

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