3,6,13,26,33,66,?

• 3*2=6
  6+7=13
  13*2=26
  26+7=33
  33*2=66
  so next will be
  66+7=73
• 11 years agoHelpfull: Yes(58) No(4)
• if we focus on the series 3 13 33 ?.
  13-3=10
  33-13=20
  so if we follow the same series ..the missing no will be
  63 as 63-33=30
  hence ans=63
• 11 years agoHelpfull: Yes(12) No(20)
• answer is 73...
  
  the follows alternately multiplying with 2 and adding 7...
  let Tn,T(n-1) are nth and (n-1)th terms....
  that is Tn=2*T(n-1) if n is even..
  and Tn=T(n-1)+7 if n is odd...
  we need 7th term which is odd so, T7=T6+7=66+7=73....
  --------------------------------------
  another solution for the problem is
  
  dividing the question into two alternate series...
  3,13,33,...
  6,26,66,...
  let Tn be nth term and T(n-1) be (n-1)th term
  in first series Tn=T(n-1)+2^(n-1)*10 that is we are adding 10,20,40,... to previous term...
  so T4=T3+40=33+40=73
  in second series Tn=T(n-1)+2^(n-1)*20 that is we are adding 20,40,80,... to previous term...
• 11 years agoHelpfull: Yes(6) No(4)
• add 7 after 66 so ans is 73
• 11 years agoHelpfull: Yes(5) No(0)
• 3+3=6
  6+7=13
  13+13=26
  26+7=33
  33+33=66
  66+7=73
• 11 years agoHelpfull: Yes(5) No(0)
• 73 is next number because of 3*2=6
  6+7=13
  same is follow for all those as well as 33*2=66
  66+7=73
• 11 years agoHelpfull: Yes(3) No(0)
• 73
  13-6=7
  33-26=7
  x-66=7
  x=73
• 11 years agoHelpfull: Yes(1) No(2)
• 53 answer since (3,3*2),(13,13*2),(33,33*2) next 53
• 9 years agoHelpfull: Yes(1) No(0)
• 3*2=6
  6+7=13
  13*2=26
  26+7=33
  33*2=66
  so next will be
  66+7=73
• 9 years agoHelpfull: Yes(0) No(0)
• 3*2=6,6+7=13,13*2=26,26+7=33,33*2=66,66+7=73
  
• 9 years agoHelpfull: Yes(0) No(0)
• 3,13,33,53
  6,26,66 that mean 3*2=6,13*2=26,33*2=66
• 9 years agoHelpfull: Yes(0) No(0)
• 3*2=6 & 3+10=13
  13*2=26 & 13+20=33
  33*2=66 & 33+30=63
• 7 years agoHelpfull: Yes(0) No(0)
• 3,13,33 ?=63 ans
  if options does not having this option go for 73
• 7 years agoHelpfull: Yes(0) No(0)
• 132
  3*2=6 in the way it was repeated.., so 66*2=132
• 7 years agoHelpfull: Yes(0) No(0)
• muliply 3 into 2 and add 6+7 again multiply by 2 add 7 process continues devolp logic ans is 73.
• 4 years agoHelpfull: Yes(0) No(0)