Multiple Choice Questions

If x 19 and y 18 then the value of x2 y2 xy x3 ndash y3 is ........

Quantitative Aptitude (CDS) Algebra

If x = 19 and y = 18, then the value of x²+ y² + xy/x³ – y³is

324

361

Expression = x²+ y² + xy /x³ – y^3

=(x²+ y² + xy) /(x – y)(x²+ y² + xy)
= 1 /x - y
= 1 /19- 18 = 1

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