CAT Practice : Functions

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(See the solution provided even if you were able to solve)

Function of a function

    Q.14: For this question, assume the following operators: A*B = A2 - B2
    A-B =
    A+B = A * B
    = A+B
    Which of the following expression would yield the result as x subtracted by y?

    1. (x*y)-(x+5)
    2. ()*(x-y)
    3. (x*y) - ()
    4. (x+y)*(x-y)

 

  • Correct Answer
    Choice C. (x*y) - ()

Detailed Solution

Never solve each expression. Solve by assigning values of x and y

Let x = 6, y = 2 Therefore, required x – y = 4
x*y = 62 – 22 = 32

x-y = = 3

x+y = 6 x 2 = 12

= 6 + 2 = 8

a) 32-12 = not equal to 4

b) 8*3 = 82 - 32 = 55 not equal to 4

c) 32 - 8 = = 4

d) 12*3 = 122 - 32 not equal to 4

Answer choice (C).


Correct Answer: (x*y) - ()



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