Question 845949: Next number in sequence
3, -6 , 12, 4, 20
7, 16, 8, 27, 9
2, 7, 26, 101, 400
7, 21, 8, 72, 9
Answer by AnlytcPhil(1806)   (Show Source):
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3, -6 , 12, 4, 20
Start with 3
3 - 9 = -6
-6 + 18 = 12
12 - 8 = 4
4 + 16 = 20
20 - 7 = 13
13 + 14 = 27
27 - 6 = 21
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7, 16, 8, 27, 9
7
2×8 = 16
8
3×9 = 27
9
4×10 = 40
10
5×11 = 55
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7, 26, 101, 400
Start with 7
7×4-2 = 28-2 = 26
26×4-3 = 104-3 = 101
101×4-4 = 404-4 = 400
400×4-5 = 1600-5 = 1595
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7, 21, 8, 72, 9
Start with 7
7
7×31 = 7×3 = 21
8
8×32 = 8×9 = 72
9
9×33 = 9×27 = 243
10
10×34 = 10×81 = 810
Edwin
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