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

QUESTION
 

Find the sum of the first 20 terms of the arithmetic series if  large a_1=5  and  large a_2_0=62 .

OPTIONS
A. 

630

B. 

680

C. 

660

D. 

670

Right Option : D

EXPLANATION
Explain TypeExplanation Content
Text

large S_2_0=frac{20(5 + 62)}{2} = 670

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