1. If 14 $ 8 = 91 and 18 $ 4 = 51, then 21 $ 9 = ?
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By: anil on 05 May 2019 02.27 am
For the numbers of the form : $$x$$ $ $$y=(x-1) imes(y-1)$$ Eg :- $$(14-1) imes(8-1)=(13 imes7)=91$$ and $$(18-1) imes(4-1)=(17 imes3)=51$$ Similarly, $$(21-1) imes(9-1)=(20 imes8)=160$$ => Ans - (A)
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