complete the series
3, 5, 15, 17, 51, 53, ?
ans- 106
explain how.
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the answer should be 159
take them as doublets
3,5 are a set and there difference is 2 and when we multiply 3, we get 15
15,17 are a set and their difference is 2 and when we multiply 3,we get 51
51,53 are a set and their difference is 2 and when we multiply 3,we get 59
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