There are infinitely many possible solutions. One possible answer is 213 which is the next number generated by the rule:
Un = (103n4 - 1242n3 + 5201n2 - 8670n + 4680)/24
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There are infinitely many possible solutions. One possible answer is 213 which is the next number generated by the rule:
Un= (103n4 - 1242n3+ 5201n2- 8670n + 4680)/24
3, -6, 12, 4, 20, ?
The sequence changes by multiplying with different numbers: from 3 to -6 (* -2), -6 to 12 (* -2), 12 to 4 (* 0.33), and 4 to 20 (* 5). If we continue this pattern, 20 multiplied by 0.5 gives us 10. So, the next number is 10.
20/12 = 5/3 = 12/3
The next is 3.
20/12 = 18/12 = 12/3