"In an A.P.,   the first term is 22, `n t h` term is `-11` and the sum   to first `n` terms is   66.
Channel: Doubtnut
Date: 2020-06-28

"In an A.P.,
 
  the first term is 22, `n t h`
 term is `-11`
 and the sum
 
  to first `n`
 terms is
 
  66. Find `n`
 and `d`
 , the
 
  common difference."