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Question

The sum up to n terms of an AP with first term a, last term l and common difference d is


  1. n2(2a+(n1)d)

  2. n(2a+(n1)d)
     

  3. n2(a+l)
     

  4. n2(a+l)d


Solution

The correct options are
A

n2(2a+(n1)d)


C

n2(a+l)
 


The sum up to n terms of an AP with first term a and common difference d is n2(2a+(n1)d) and the sum up to n terms of an AP with first term a and last term l is n2(a+l).

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