Which term of the A.P. 3,15,27,39,... will be 132 more than its 54th term?

• 65th term.
  
  Let a = First term
  And z = Last term
  And d = difference between the terms.
  
  Here, a =3, d=( 15-3)=12
  
  Since Z = ak = (n-k)d
  
  Z – a54 = (n-54)12
  132 = 12n – 54 * 12(since Z – a 54 = 132 given)
  12n = 132 + 54 * 12 = 12(11+ 54)
  
  n = 11+54 = 65
• 12 years agoHelpfull: Yes(6) No(1)