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Find out the wrong number in the series : 1, 1, 2, 6, 24, 96, 720

Correct answer: C. 96

  • A. 6
  • B. 24
  • C. 96
  • D. 720

Explanation

The terms follow factorials: 1, 1, 2, 6, 24, 120, 720, so the sixth term should be 5! = 120, not 96. A student may choose 720 because it is the final term and appears after the incorrect 96, overlooking that 720 itself equals 6!.

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Sequences describe ordered terms formed by a pattern, while series represent the sum of those terms. Questions cover arithmetic and geometric sequences, their nth terms, common difference or ratio, finite sums, and applications, with the sequence itself kept distinct from the corresponding series.

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