Discussion
How many 4's are there preceded by 7 but not followed by 3?
5 9 3 2 1 7 4 2 6 9 7 4 6 1 3 2 8 7 4 1 3 8 3 2 5 6 7 4 3 9 5 8 2 0 1 8 7 4 6 3
Answer: A
Correct answer: Four
Four 4s have a 7 before them and something other than 3 after them: 7 4 2, 7 4 6, 7 4 1 and the last 7 4 6. The 4 in 7 4 3 is ruled out by the 3 that follows it. So the answer is four.
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