Discussion

Find out the wrong number in the given sequence of numbers 5, 16, 6, 16, 7, 16, 9

Answer: A

Two series are interleaved. The even positions are all 16, while the odd positions count up by one.

\[ \text{odd positions: } 5,\; 6,\; 7,\; \mathbf{8} \]

\[ \text{even positions: } 16,\; 16,\; 16 \]

The seventh term should be 8, not 9.

So 9 is the wrong number. The repeated 16 is the clue that two separate sequences are woven together.

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