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Sticky Note
Find the missing number in the series:15, 45, ?, 405.
  1. 405 90
  2. 75
  3. 135
  4. None of these
Explanation
Given series: 15, 45, ?, 405
Let's find the pattern:
15 × 3 = 45
45 × 3 = 135
135 × 3 = 405
The pattern is obtained by multiplying the previous term by 3.

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