Complete the Arithmetic Sequence: Finding Missing Numbers After 15

Fill in the missing numbers

-3-3-3333999151515

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1

Understand the problem

Fill in the missing numbers

-3-3-3333999151515

2

Step-by-step solution

Let's look at the numbers from left to right:

−3,3,9,15 -3,3,9,15

We notice that the common operation is:

+6 +6

−3+6=3 -3+6=3

3+6=9 3+6=9

9+6=15 9+6=15

Therefore, the next sequence will be:

15+6=21 15+6=21

21+6=27 21+6=27

3

Final Answer

27, 21

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All negative numbers appear on the number line to the left of the number 0.

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