Q. Complete the series:
7,26,63,124,215,342,?

• ans: 511
  the given series is 7,26,63,124,215,342
  we can write the series as
  2^3-1=7
  3^3-1=26
  4^3-1=63
  5^3-1=124
  6^3-1=215
  7^3-1=342
  so the next term will be
  8^3-1=511
• 10 years agoHelpfull: Yes(9) No(0)
• ans:511
  reason:
  26-7=19=18*1 + 1
  63-26=37=18*2 + 1
  124-63=61=18*3 + 7
  215-124=91=18*4 + 19
  342-215=127=18*5 +37
  now note 1,7,19,37.
  7-1=6
  19-7=12
  37-19=18
  thus next term here is 37+24=61
  so next term in main sequence is
  342 +18*6 + 61=511.
  
  
  
  
• 10 years agoHelpfull: Yes(1) No(1)
• 511 is the answer. it is a series of n^2-1
• 10 years agoHelpfull: Yes(0) No(1)
• 511 ...(n^3-1)..
• 10 years agoHelpfull: Yes(0) No(0)
• ALL ARE N CUBE -1
  8 CUBE-1=511
• 10 years agoHelpfull: Yes(0) No(0)
• 511.... n^3-1
• 10 years agoHelpfull: Yes(0) No(0)
• 7=(2^3 -1),26=(3^ -1),63=(4^3 -1)so as...8^3 -1=511 answer/
• 10 years agoHelpfull: Yes(0) No(0)
• 2^3 -1,3^3 -1,4^3-1,......
• 8 years agoHelpfull: Yes(0) No(0)