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1. x-y=10

  • A. 20
  • B. 20
  • C. 20
  • D. 20

Answer: Option B

Explanation:

x - y= 10  x3- y3= 1900  xy= ?   x3y3=(x  y)3+3xy (xy)  1900=(10)3+3xy.10  1000+30xy=1900  30xy= 1900-1000  xy=900/30  xy=30

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