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1. যদি a3 - b3 = 513 এবং a-b = 3 হয় তবে ab এর মান কত?
- A. 54
- B. 54
- C. 54
- D. 54
Answer: Option A
Explanation:
a^3−b^3=513
⇒(a−b)^3+3ab (a−b) =513
⇒(3)^3+3ab ×3=513
⇒9ab =513−27
⇒ab=486/9
.'. ab=54
⇒(a−b)^3+3ab (a−b) =513
⇒(3)^3+3ab ×3=513
⇒9ab =513−27
⇒ab=486/9
.'. ab=54
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