General Studies · Number Series and Sequence
Count each 1 in the following sequence of numbers that is immediately followed by 2, provided that this 2 is NOT immediately followed by 3. How many such 1s 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
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