SOLUTION: How to solve this missing number 21 and 63

Algebra.Com
Question 790145: How to solve this missing number 21 and 63
Answer by fcabanski(1391)   (Show Source): You can put this solution on YOUR website!
63-21 = 42. 42/2 = 21. This could be a three number sequence with each number 21 greater than the number before it.


21 42 63

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