"Find the   sum of the first 25 terms of an A.P. whose `n t h` term is   given by `a_n=7-3n` ."
Channel: Doubtnut
Date: 2020-06-28

"Find the
 
  sum of the first 25 terms of an A.P. whose `n t h`
 term is
 
  given by `a_n=7-3n`
 ."