The number of digits in $${{\text{4}}^9} \times {{\text{5}}^{17}}{\text{,}}$$ when expressed in usual form, is - Options: A . &nbsp16 B . &nbsp17 C . &nbsp18 D . &nbsp19

The number of digits in $${{\text{4}}^9} \times {{\text{5}}^{17}}{\text{,}}$$

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