What should come in place of question mark in the following number series?
\(18^{19.8} ÷ 18^{8.7} × 18^{-2.1} = 18^{?^2-7}\)
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What should come in place of question mark in the following number series?
\(18^{19.8} ÷ 18^{8.7} × 18^{-2.1} = 18^{?^2-7}\)