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Question

 5)3+(2)3+(3)3=
  1. - 90
  2. 90
  3. - 60
  4. 60


Solution

The correct option is B 90
The given expression is
53+(2)3+(3)3.
Let a=5,b=2 and c=3.
We can observe that a+b+c=5+(2)+(3)=0.
We know that if a+b+c=0, then a3+b3+c3=3abc.
53+(2)3+(3)3=3(5)(2)(3)=90

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