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What number should replace the question mark in the series: 3, 8, 15, 24, ?, 60

Answer: B. 36
The pattern is n^2 + n: 1^2+1=2, 2^2+2=6, 3^2+3=12, 4^2+4=20, 5^2+5=30, 6^2+6=42.
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