1 . a 3 − b 3 = 513  এবং  a − b = 3  হলে ab এর মান কত?  

• A. 45
• B. 60
• C. 48
• D. 54

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Answer: Option D

Explanation:

2 . $x+y=6$ এবং $xy=8$ হলে, ${\left(x-y\right)}^2$ এর মান কত?

• A. 4
• B. 6
• C. 8
• D. 12

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Answer: Option A

Explanation: