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Mathematics for IGCSE & O level - Sequences (Section 2 - No. 30)

What is the second difference in the sequence 2, 5, 10, 17, 26...?
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Açıklama

5-2=3, 10-5=5, 17-10=7, 26-17 = 9. 5-3=2, 7-5=2, 9-7=2.

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