SOLUTION: 7,21,63,__ can you find the missing number?

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Question 778122: 7,21,63,__ can you find the missing number?
Answer by jim_thompson5910(35256) About Me  (Show Source):
You can put this solution on YOUR website!
The rule is: multiply the last term by 3 to get the next number.

So the missing number is 63*3 = 189