Department of Pre-University Education, KarnatakaPUC Karnataka Science Class 11
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If the Sum of N Terms of an A.P. Be 3 N2 − N and Its Common Difference is 6, Then Its First Term is - Mathematics

MCQ

If the sum of n terms of an A.P. be 3 n2 − n and its common difference is 6, then its first term is

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Solution

2

\[S_n = 3 n^2 - n\]

\[ \Rightarrow S_1 = 3 \left( 1 \right)^2 - 1\]

\[ \Rightarrow S_1 = 2\]

\[ \therefore a_1 = 2\]

  Is there an error in this question or solution?
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APPEARS IN

RD Sharma Class 11 Mathematics Textbook
Chapter 19 Arithmetic Progression
Q 3 | Page 51
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