Mathematics for IGCSE & O level - Sequences (Section 2 - No. 12)
Which of the following is the next term of the quadratic sequence 8, 13, 20, 29, 40, ...?
53
51
55
57
解释
The sequence of differences are 5, 7, 9, 11. The next difference should be 13. 40 + 13 = 53.