Question 29

If 14 $ 8 = 91 and 18 $ 4 = 51, then 21 $ 9 = ?

Solution

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)

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