QUESTION:
what is the missing of 3 , 9 , 12 , 15 , __ , 21 , 24?
ANSWER
The next number to the sequence is 18
Multiply each Natural number with three.
- 3×3 = 9
- 3×4 = 12
- 3×5 = 15
- 3×6 = 18
- 3×7 = 21
- 3×8= 24
Hence the next number in the sequence is 18.
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