What should come in place of the question mark (?) in the following number series ?
9, 15, 27, 45, 69, ?
The pattern here followed is :
9 + 6 * 1 = 15
15 + 6 * 2 = 27
27 + 6 * 3 = 45
45 + 6 * 4 = 69
69 + 6 * 5 = 99
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