Discussion
Find out the wrong number in the series 1, 1, 2, 6, 24, 96, 720
Answer: B
The series is the factorials.
\[ 0! = 1,\; 1! = 1,\; 2! = 2,\; 3! = 6,\; 4! = 24,\; 5! = 120,\; 6! = 720 \]
The sixth term should be \( 5! = 120 \), not 96.
So 96 is wrong. Equivalently each term is the previous multiplied by its position: \( 24 \times 5 = 120 \), and \( 120 \times 6 = 720 \) closes the series correctly.
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