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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

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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

Q: What is the next number 3 -6 12 4 20?

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3, -6, 12, 4, 20, ?

20/12 = 5/3 = 12/3

The next is 3.

20/12 = 18/12 = 12/3

There is a mistake in the question -fourth number should not be 122² = 45² = 258² = 6411² = 121 (not 12)14² = 19617² = 289so add 3 to previous number then square it17 + 3 = 20then 20² = 400 next number

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3, -6, 12, 4, 20, ?

20

13 is one possibility.

22

The next number in the sequence is 20. You are alternately multiplying the previous number by two and then subtracting two.

20/12 = 5/3 = 12/3

3, -6, 12, 4, 20, 13, 27, 21, 33 -9, +18, -8, +16, -7, +14, -6, +12

The next is 3.

20/12 = 18/12 = 12/3

1/2, 2/3. 3/4, 4/5, 5/6 1/2 of 60 = 30 2/3 of 30 = 20 3/4 of 20 = 15 4/5 of 15 = 12 5/6 of 12 = 10 The next number is 10

There is a mistake in the question -fourth number should not be 122² = 45² = 258² = 6411² = 121 (not 12)14² = 19617² = 289so add 3 to previous number then square it17 + 3 = 20then 20² = 400 next number

20 over 12 s a mixed number = 12/3