4      12      42        196      1005      6066      42511

  • 196
  • 1005
  • 42
  • 12
  • 6066
  • Explanation:

    Solution is,

    4×2+(2)2=12

    12×3+(3)2=45

    45×4+(4)2=196

    196×5+(5)2=1005

    1005×6+(6)2=6066

    6066×7+(7)2=42511

    so 42 is wrong

4      12      42        196  
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