General Studies · Sequence and Series
Count each '1' in the following sequence of numbers that is immediately followed by '2', provided that '2' is NOT immediately followed by '3': 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 How many such 1s are there?
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