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in Tamilnadu Board by (25 points)
(viii) \( a_{n}=4, d=2 \) और \( S _{n}=-14 \) दिया है। \( n \) और \( a \) ज्ञात कीजिए।

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समीकरण (1) से a = 6 - 2n का मान समीकरण (2) में रखने पर,

n = 7 का मान समीकरण (1) में रखने पर,

a + 2 x 7 = 6 ⇒ a = 6 -14 = -8

अत: a एवं n के अभीष्ट मान क्रमशः - 8 और 7 हैं।

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