12 12
The difference between the successive numbers is 4. so the next three numbers could be 4, 0 and -4.
The two numbers with an absolute value of 12 are -12 and 12.
If the GCF of two numbers is 12 and the LCM is 24, the two numbers are 12 and 24.
12, 10 and 15 the are alternatively increased by 2 and 3
The next two numbers are 26 & 78.
21 and 13. The pattern is t(n) = (-n4 + 10n3 - 23n2 + 38n - 12)/12
-15 tn = (-1)n *3n for n = 1,2,3,...
-17, -22
12 12
The difference between the successive numbers is 4. so the next three numbers could be 4, 0 and -4.
The next three numbers are: 87, 141, 228. Each number in the sequence after the first two is the sum of the previous two numbers. This is a variation of the Fibonacci sequence which starts with 1, 1, ... (and then continues ..., 2, 3, 5, 8, 13, ...).
-12, 14, -16
The next two numbers in the sequence are... 45 & 54.
24, 65.
12 and 1
Check the differences between each two numbers... write the answers down and you will see the pattern. Good Luck!