Discussion
How many such 5s are there in the following number sequence each of which is immediately preceded by 3 or 4 but not immediately followed by 8 or 9?
3 5 9 5 4 5 5 3 5 8 4 5 6 7 3 5 7 5 5 4 5 2 3 5 1 0
Answer: D
Correct answer: Five
Five 5s have a 3 or a 4 immediately before them and something other than 8 or 9 after them - the 5s at the sixth, twelfth, sixteenth, twenty-first and twenty-fourth places. The rest are ruled out either by what precedes them or by an 8 or 9 following. So the answer is five.
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