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Question

Aptitude Questions:

 

Directions (Q. No. 19-20): What should come in place of question mark (?) in the following number series?

 

1      2      6     21      ?      445     2676

  • 62
  • 64
  • 84
  • 88
  • None of these
Answer- D

Pattern as follows, x1+1, x2+2, x3+3, x4+4, x5+5, x6+6

For example, 1x1+1 = 2,

                    2x2+2 = 6

Hence required number = 21x4+4 = 84+4 = 88


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