Question 18

If x% y = $$\ y^{2}-x^{2}$$,x$y=$$x\div y^{2}$$, x # y = 2xy, then value of {(13 % 5) $ 6} # 15 is

Solution

Expression : {(13 % 5) $ 6} # 15

$$\equiv[(5^2-13^2)\div6^2]\times2\times15$$

= $$[(25-169)\div36]\times30$$

= $$\frac{-144}{36}\times30$$

= $$-4\times30=-120$$

=> Ans - (D)


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