Maths / Arithmetic Progression / Sum of First n Terms

QUESTION

If the sum of 1st n terms of an AP is 2n(n + 3) , what is the value of its 6th term?

 OPTIONS A. 24 B. 28 C. 32 D. None of these
Right Option : B

EXPLANATION
Explain TypeExplanation Content
Text

$S_n-S_n_-_1=a_n$

$S_6-S_5=[2X6(6+3)]-[2X5(5+3)]$

=(108-80)=28

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