Find out the wrong number in the series:
5, 15, 30, 135, 405, 1215, 3645

2 Answers on this Question

1. 30 is ans …
   All is multiple of 3 for example
   5*3=15
   15*3=45
   45*3= 135
   135*3=405
   405*3=1215

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2. 5 is the answer….
   Remaining all are the multiples of 3 expect 5

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