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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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