Class 10 Math All topics Arithmetic Progressions
If is an A.P. such that then is equal to-
(a)
(b)
(c)
(d)
Correct answer: (d) 
Solution: 
Here we use the following formula to calculate the sum of first n terms of an AP:  
Since


Now  

           

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Similar topics
introduction to trigonometry
functions
some applications of trigonometry
quadratic equations
surface areas and volumes
widgit image
Connecting you to a tutor in 60 seconds.
Get answers to your doubts.
play store logo
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introduction to trigonometry
functions
some applications of trigonometry
quadratic equations
surface areas and volumes