Maths / Arithmetic Progression / Sum of First n Terms

QUESTION
 

If the sum and the product of 1st 3 terms of an AP Series is 42 and 2240 respectively, what are the terms of the series?

OPTIONS
A. 

8,12,16

B. 

8,14,20

C. 

10,16,22

D. 

None of these

Right Option : B

EXPLANATION
Explain TypeExplanation Content
Text

(a-b)+a+(a+d)=42Rightarrow a=14

therefore (a-d)XaX(a+d)=(14-d)X14X(14+d)=2240

Rightarrow (14^2-d^2)X14=2240

therefore d=^+_-6

So,the terms are 8,14 and 20.

View Contents
(Concept based Learning and Testing for [6th - 10th], NTSE, Bank & Govt. Exams)
Self Learning
Testimonials
No Preview
Student Feedback on Methodology - Ayan ghosh C/o ABHYAS Academy
 8th
Abhyas methodology is excellent. Its teaching and assignment based technique is very fine.
Back
Courses We Offer
(Concept based Learning and Testing for [6th - 10th], NTSE, Bank & Govt. Exams)