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question mark

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

ASh , 7 Years ago
Grade 12th Pass
anser 2 Answers
Sandeep Bhamoo

Last Activity: 7 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
Approved
ASh

Last Activity: 7 Years ago

please do reply for my other questions also.
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