Discussion
3, 15, ?, 63, 99, 143
Answer: B
Correct answer: 35
Each term is one less than the square of an even number: \[ 2^2-1=3,\; 4^2-1=15,\; 6^2-1=35,\; 8^2-1=63,\; 10^2-1=99,\; 12^2-1=143 \] so the missing term is 35.
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