1.

How many such 1's are there each of which is immediately followed by 2, and 2 is not immediately followed by 3?  (SOF NCO 2016)       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      

A.  2   
B.  4   
C.  5   
D.  7 
Answer» C.  5   


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