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दर्शाइए की a(1), a(2), …… a(n),…… से एक ...

दर्शाइए की `a_(1), a_(2), …… a_(n),……` से एक A.P. बनती हैं, यदि `a_(n)` नीचे दिए अनुसार परिभाषित हैं :
`(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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