- 13
- 14
- 15
- 16
- c
-
31, 29, 24, 22, 17, _____
31-2=29
29-5=24
24-2=22
22-5=17
17-2=15
15-5=10
31, 29, 24, 22, 17, _____
31-2=29
29-5=24
24-2=22
22-5=17
17-2=15
15-5=10
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