1.5 4 20 128 ? 10505
.....what is the value off ?...

• question itself is wrong the 4th term will be 129.
  i.e 1.5 4 20 128 ? 10505
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  solution for above quetion is
  1.5*2+1*1=4,
  4*4+2*2=20,
  20*6+3*3=129,
  129*8+4*4=1048,
  1048*10+5*5=10505
• 10 years agoHelpfull: Yes(11) No(0)