What will come in place of the question mark (?) in the following number series ?
The pattern here followed is :
5 * 1 + 7.5 = 12.5
12.5 * 2 + 7.5 = 32.5
32.5 * 3 + 7.5 = 105
105 * 4 + 7.5 = 427.5
427.5 * 5 + 7.5 = 2145
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