Q. What is the next number of the following sequence.
6,9,18,45,108,351,.....

• For odd place values
  6*3=18
  18*6=108
  108*9=972
  and for even place values
  6*1+ 3^1=9
  18*2+3^2=45
  108*3+3^3=351
  972*4+3^4=39699(so ans is 972)
• 10 years agoHelpfull: Yes(46) No(12)
• as difference of 6-9=3
  that of 9-18=3^2=9
  that of 18-45=3^3=27
  that of 45-108=3^4=81
  that of 108-351=3^5=243
  there fore another difference will be 3^6=729
  there fore another number will be 729+351=1080
  so 1080 will be the required answer
• 10 years agoHelpfull: Yes(11) No(14)
• 6*3=18
  18*6=108
  108*9=972
  In Even Place
  6*1+ 3^1=9
  18*2+3^2=45
  108*3+3^3=351
  972*4+3^4=3969
  then Ans will be 972
• 10 years agoHelpfull: Yes(5) No(1)
• 972 is the answer
  
• 10 years agoHelpfull: Yes(2) No(1)
• 6-3=3
  3*3=9
  9-3=6*3=18
  18-3=15*3=45
  45-3^2=36*3=108
  108+3^2=117*3=351
  351+3=354*3=1062
• 10 years agoHelpfull: Yes(1) No(10)
• 6-3=3
  3*3=9
  9-3=6*3=18
  18-3=15*3=45
  45-3^2=36*3=108
  108+3^2=117*3=351
  351+3^2=1095
• 10 years agoHelpfull: Yes(1) No(1)
• surely ans 1080
• 10 years agoHelpfull: Yes(1) No(0)
• 6,9,18,45,108,351,1090,1118
  difference of 6&9=3*1=3
  difference of 9&18=3*3=9
  difference of 18*&45=3*3*3=27
  6+3+9+27=45
  addition of (3*3*3)+(3*3*3*3)=108
  addition of (3*3*3*3*3)+108=351
  addition of (3*3*3*3*3*3)+351=1090
  45+81+243+739=1118
  ans=1090
  
  
  
  
  
  
• 10 years agoHelpfull: Yes(0) No(11)
• 1080 is ans
  
• 10 years agoHelpfull: Yes(0) No(5)