2 9 23 79 415 ?

• 9-2=7
  23-9=14(7*2)
  79-23=56(14*4)
  415-79=336(56*6)
  so x-415=336*8 from this we get x= 3103
• 11 years agoHelpfull: Yes(48) No(7)
• difference b/w each is
  7 14 56 336
  7 7*2 7*4*2 7*8*6
  i.e 7*2^0*0! 7*2^1*1! 7*2^2*2! 7*2^3*3!
  we can say 7*2^n*n!
  
  so ans is 415 + 7*2^4*4! = 3103
• 11 years agoHelpfull: Yes(23) No(6)
• 3103 is the correct ans....
  logic
  2>9=7
  9>23=14
  23>79=56
  79>415=336.......
  like that we have to internal logic again ie.
  logic between 7 14 56 336....=2688
  *2,*4,*6,*8,*10...............
• 11 years agoHelpfull: Yes(18) No(3)
• STEP1:
  
  9-2=7
  23-9=14
  79-23=56
  415-79=336
  
  Step2:
  
  i.e 7*2=14
  14*4=56
  56*6=336
  therefore next will be : 336*8=2688
  
  so now according to step 1
  ans will be 2688+415=3103.
• 11 years agoHelpfull: Yes(14) No(0)
• 9-2=7
  23-9=14 2
  79-23=56 4
  415-79=336 6
  3103-415=2688 8
  
• 11 years agoHelpfull: Yes(4) No(0)
• 9-2=7
  23-9=14(7*2)
  79-23=56(14*2*2)
  415-79=336(56*2*3)
  s6th-415=(336*2*4)=>s6th=2688+415=3103
  
• 11 years agoHelpfull: Yes(2) No(1)
• 9-2=7, 23-9=14, 79-23=26,
  7*2, 14*4, 56*6, 336*8, ans is (336*8+415=3103)
• 11 years agoHelpfull: Yes(2) No(0)
• ans:2688
  9-2=7
  23-9=14
  79-23=56
  415-79=336
  looking at above ,we come to know the continuous even numbers are multiplied to differences and then added.
  so answer is 336*8=2688.
• 11 years agoHelpfull: Yes(1) No(2)
• 2688
  
  9-2=7
  similarly
  23-9,79-23,415-79 and theie diff will increase simultaneously with increase in number by 2
• 11 years agoHelpfull: Yes(0) No(0)
• question: 2 9 23 79 415
  diffrence: 7 14 56 336
  now :7*2=14
  14*4=56
  56*6=336
  336*8=2688
  answer :2688+415=3103
• 11 years agoHelpfull: Yes(0) No(0)
• diffn are considered
  7,14,56,336
  as 7*2=14,
  14*4=56
  56*6=336
  336*8=2664
  ans 415+2664=3079
• 11 years agoHelpfull: Yes(0) No(3)