Count each 1 in the fol

Question

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 l'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: Option B

[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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