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If a 1, a 2, a 3, .....,a n are in A.P. such that a 4 -a 7 +a 10 =m,then the sum of first 13 terms of the A.P. is: OPTIONS: 10m 12m 13m 15m

If a1, a2, a3,.....,an are in A.P. such that a4-a7+a10=m,then the sum of first 13 terms of the A.P. is:
OPTIONS:
  • 10m
  • 12m
  • 13m
  • 15m
  •  

Grade:12th Pass

2 Answers

Sandeep Bhamoo
443 Points
4 years ago
a4 - a7+a10 = a1+3d+a1+9d-a1-6d =a1+6d =m. Now sum of first 13 terms = (13/2)(2•a1+12d) =13m. Please do approve my answer if correct
ASh
62 Points
4 years ago
please do reply for my other questions also.

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