If 14 $ 8 = 91 and 18 $ 4 = 51, then 21 $ 9 = ?
For the numbers of the form : $$x$$ $ $$y=(x-1)\times(y-1)$$
Eg :- $$(14-1)\times(8-1)=(13\times7)=91$$
and $$(18-1)\times(4-1)=(17\times3)=51$$
Similarly, $$(21-1)\times(9-1)=(20\times8)=160$$
=> Ans - (A)
Create a FREE account and get: