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1, 2, 6, 15, 31, 56, 91

  • A.31
  • B.15
  • C.56
  • D.91
  • E.2

Answer: D

Correct answer: 91

The gaps should be the successive squares: \( 1, 4, 9, 16, 25, 36 \). They run correctly to 56, but the last step adds only 35, giving 91 where it should give \( 56 + 36 = 92 \). So 91 is the wrong term.

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