SOLUTION: What is the next number in these 4 sequences? 1. 3, -6, 12, 4, 20, ? 2. 7, 16, 8, 27, 9, ? 3. 2, 7, 26, 101, 400, ? 4. 7, 21, 8, 72, 9, ?

Question 890021: What is the next number in these 4 sequences?
1. 3, -6, 12, 4, 20, ?
2. 7, 16, 8, 27, 9, ?
3. 2, 7, 26, 101, 400, ?
4. 7, 21, 8, 72, 9, ?
Answer by richwmiller(17219) (Show Source): You can put this solution on YOUR website!
3 -9 27 -53 103
-6 18 -26 50 103
12 -8 24 153
4 16 177
20 193
213
The sixth term could be 213
7 9 -17 44 -108
16 -8 27 -64 -108
8 19 -37 -172
27 -18 -209
9 -227
-218
The sixth term could be -218
2 5 14 42 126
7 19 56 168 126
26 75 224 294
101 299 518
400 817
1217
The sixth term could be 1217

7 14 -27 104 -308
21 -13 77 -204 -308
8 64 -127 -512
72 -63 -639
9 -702
-693
The sixth term could be -693

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