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What will come in place of the question mark (?) in the following number series ‘?
The Series follows the pattern
9
9 + 12 $$ \times$$ 1 = 21
21 + 12 $$ \times$$ 2 = 45
45 + 12 $$ \times$$ 3 = 81
81 + 12 $$ \times$$ 4 = 129
129 +12 $$ \times$$ 5 = 189
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