Question

What are the next two numbers in the sequence 21, 18, 13, 6,

Answer 1

Answer: -3, -14

Explanation:

You can see that from 21 to 18 the difference is -3

18 to 13 is -5

13-6 is -7

See the pattern yet? The difference of the numbers are subtracted by 2 again.

-3, -5, -7, then it's -9. then -11

So 6+(-9) = -3

-3+(-11) = -14

Answer 2

-3,-14

Explanation:

21

18 (-3)

13 (-5)

6 (-7)

-9 .... 6-9 = -3

-11 ... -3 - 11 = -14