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If you have a set of 3 or more numbers , such as 5 & 15 & 45 you will notice that 15 is 3 times the quantity as the number preceding it. You also notice that 45 is 3 times as large as the number preceding it . So we say that the RATIO between the numbers is 3 in both cases. Hence there is a COMMON RATIO. The next number in this series would need to also be in the ratio of 3 and so the next number would be 45X3 equals 135.
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