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If the sum of first $n$ terms of an A.P. is $3n^2 + 4n$ and its common difference is $6$, then its first term is :
- (a)$7$
- (b)$6$
- (c)$4$
- (d)$3$
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(A) $7$
If the sum of first n terms of an A.P. is 3n2 + 4n and its common difference is 6 , then its first term is : (A) 7 (C)…
CBSE Class 10 Maths PYQ · Arithmetic Progressions · Sum Formula · 1 Mark · March 2024 · Standard
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