16 . ${\log }_{10}\left(x+6\right)-{\log }_{10}\left(x+2\right)=\log x$ হলে, x এর মান কত?

• A. $2$
• B. $3$
• C. $-3$
• D. 2 বা -3

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Answer: Option A

Explanation:

17 . $5\sqrt{5}$ এর 5 ভিত্তিক লগ কত?

• A. $\sqrt{5}$
• B. $\frac{2}{3}$
• C. $\frac{3}{2}$
• D. $5$

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Answer: Option C

Explanation:

18 . 32 এর 2 ভিত্তিক লগারিদম কত?

• A. 6
• B. 3
• C. 4
• D. 5

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Answer: Option D

Explanation: