Maths / Arithmetic Progression / Sum of First n Terms

QUESTION

If $\dpi{120} \fn_jvn \large S_n = 2n^2-10$, the value of the 4th term of the AP

 OPTIONS A. 14 B. 10 C. 15 D. 13
Right Option : A

EXPLANATION
Explain TypeExplanation Content
Text

$\dpi{120} \fn_jvn \large S_n = 2n^2-10$

$\dpi{120} \fn_jvn \large a_4= s_4 - s_3$

$\dpi{120} \fn_jvn \large a_4= 2(4)^2-10 -2(3)^2+10 = 32- 18= 14$

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