A 50 and 60
B 60 and 70
C 80 and 90
D 90 and 100
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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