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Count each 1 in the following sequence of numbers that is immediately followed by 2, if 2 is not immediately followed by 3. How many such 1's are there ?
1  2  1  3  4  5  1  2  3  5  2  1  2  6  1  4  5  1  1  2  4  1  2  3  2  1  7  5  2  1  2  5

Answer: B. 4

1  2  1  3  4  5  1  2  3  5  2  1  2  6  1  4  5  1  1  2  4  1  2  3  2  1  7  5  2  1  2  5

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