Find ?
4, 5, 18, 81, ?, 2065.
option
(1) 388
(2) 365
(3) 350
(4) 361
(5) 1032

• here the series is formed using this logic..
  4*1+ 1^3=5
  5*2+ 2^3=18
  18*3+3^3=81
  so, 81*4+4^3=388
• 10 years agoHelpfull: Yes(3) No(0)
• ans: 388
  
  4
  (4*1)+1^3 =5
  (5*2)+2^3 =18
  (18*3)+3^3 = 81
  (81*4) + 4^3 =388
• 10 years agoHelpfull: Yes(0) No(0)
• 4*1+1^3=5
  5*2+2^3=18
  18*3+3^3=81
  81*4+4^3=388
  388*5+5^3=2065
  
• 10 years agoHelpfull: Yes(0) No(0)