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1. a- b = 4 এবং ab = 20 হলে a3 -b3 এর মান কত?
- A. 64
- B. 64
- C. 64
- D. 64
Answer: Option C
Explanation:
a3-b3
= (a-b)3+3ab(a-b)
=43+3×20×4
=64+240
=304
= (a-b)3+3ab(a-b)
=43+3×20×4
=64+240
=304
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