One possibility is -2, -7 and -16.
These are based on fitting the cubic rule:
Un = (-n3 + 10n2 - 39n + 62)/4 for n = 1, 2, 3, ...
2, 1, 0.5 Half the term each time.
because you add the first 2 terms and the next tern was the the sum of the first 2 terms.
Consecutive terms in the sequence are being divided by -2. Therefore, -1 / -2 = 1/2 or 0.5.
Ignoring the "9" , then this is a Fibonacci sequence. 2,2,4,6,10 The first two terms are 'seed' terms then successive terms equal the sum of the two previous terms. 2 + 2 = 4 2 + 4 = 6 4 + 6 = 10 The next term would be 6 + 10 = 16.
13 21 34 55
Which sequence? Oh, that one! The first three terms are 1, 2 and 72.
2, 1, 0.5 Half the term each time.
-8-4-2-1-1/2-1/4-1/8
The pattern looks like the previous number is multiplied by -3, hence the next number in the sequence would be (-54) x (-3) = 162
1, 2, 4
-2,-4,-6.
They are: 10 and 16
because you add the first 2 terms and the next tern was the the sum of the first 2 terms.
The first thing to notice is that all the numbers in the sequence are square numbers. 25=5x5 36=6x6 49=7x7 64=8x8 81=9x9 So the next three numbers to be squared are 10, 11 and 12. 10x10=100 11x11=121 12x12=144 Thus, the next three numbers in the sequence are 100, 121, 144 The equation for the sequence is (n+4)2
Consecutive terms in the sequence are being divided by -2. Therefore, -1 / -2 = 1/2 or 0.5.
Each number is 3 times the previous number so they would be 162, 486, and 1,458.
Ignoring the "9" , then this is a Fibonacci sequence. 2,2,4,6,10 The first two terms are 'seed' terms then successive terms equal the sum of the two previous terms. 2 + 2 = 4 2 + 4 = 6 4 + 6 = 10 The next term would be 6 + 10 = 16.