Discussion
2,2,5, 13,28,?
Answer: D
Correct answer: 52
The gaps are one less than successive squares: \( 2-2=0 \), \( 5-2=3 \), \( 13-5=8 \), \( 28-13=15 \) - that is \( 1^2-1, 2^2-1, 3^2-1, 4^2-1 \). The next gap is \( 5^2-1=24 \), giving \[ 28 + 24 = \mathbf{52} \]
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