How many even numbers are there in the following sequence of numbers whiich are immediately followedby an odd number as well as immediately preceded by an even number ?
8  6  7  6  8  9  3  2  7  5  3  4  2  2  3  5  5  2  2  8  1  1  9

Answer: E. None of these

6  7  6  8  9  3  2  7  5  3  4  2  2  3  5  5  2  2  8  1  1  9