Maths / Arithmetic Progression / Find Sum of N Terms When A.P. and Last Term is Given

QUESTION

Find the sum of the first 40 terms of the arithmetic sequence 2, 5, 8, 11, __________ .

 OPTIONS A. 2120 B. 2420 C. 3220 D. 3440
Right Option : B

EXPLANATION
Explain TypeExplanation Content
Text

$\dpi{120} \fn_jvn \large a_4_0=a_1+(n-1)d =2+39(3)=119$

$\dpi{120} \fn_jvn \large S_4_0=40(2 + 119)2=2420$

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