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

large a_4_0=a_1+(n-1)d =2+39(3)=119

large S_4_0=40(2 + 119)2=2420

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