The difference of two numbers is 2 and the difference of their squares is The difference of their cubes will be between.

A    50 and 60

B    60 and 70

C    80 and 90

D    90 and 100

Solution

Correct Answer: Option D

 

here, a-b=2  according to question, a2-b2=16 or,(a+b)(a-b)=16 or,a+b=8  

A+B=8 A-B=2 so,a=5 b=3 a3-b3=53-33=98

 

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