• A. $\frac{5}{2}$
• B. $\frac{1}{2}$
• C. $\frac{125}{2}$
• D. $\frac{25}{\sqrt{5}}$

Answer: Option A

Explanation:

• B. 1
• C. -1
• D. 4

Answer: Option A

Explanation:

• A. 2
• B. 3
• C. 4
• D. 1

Answer: Option B

Explanation:

• A. 6520
• B. 6530
• C. 6540
• D. 6560

Answer: Option D

Explanation:

• A. 6
• B. 5
• C. 8
• D. 7

Answer: Option D

Explanation:

• A. 72
• B. 84
• C. 76
• D. 96

Answer: Option B

Explanation:

• A. $3\sqrt{3}$
• B. $3$
• C. $\sqrt{3}$
• D. $\frac{1}{\sqrt{3}}$

Answer: Option A

Explanation:

• A. $S_{\infty }= \frac{20}{3}$
• B. $S_{\infty }= \frac{3}{20}$
• C. $S_{\infty }= 20$
• D. $S_{\infty }= 3$

Answer: Option B

Explanation:

• A. $-\sqrt{3}$
• B. $9$
• C. $-9\sqrt{3}$
• D. $3\sqrt{3}$

Answer: Option D

Explanation:

• A. $\frac{n\left(n+1\right)}{2}$
• B. $\frac{n\left(n+1\right)\left(2n+1\right)}{6}$
• C. ${\left\{\frac{n\left(n+1\right)}{2}\right\}}^2$
• D. একটিও নয়

Answer: Option C

Explanation:

• A. 3
• B. 4
• C. 5
• D. 6

Answer: Option D

Explanation:

• A. $\frac{১}{২৫}$
• B. $\frac{৫}{২০}$
• C. $\frac{৯}{২৫}$
• D. $\frac{৩}{২০}$

Answer: Option C

Explanation:

• A. ৯তম পদ
• B. ১০ তম পদ
• C. ১১ তম পদ
• D. ১২ তম পদ

Answer: Option A

Explanation:

• A. ৯ তম পদ
• B. ১০ তম পদ
• C. ১১ তম পদ
• D. ১২ তম পদ

Answer: Option A

Explanation:

• A. $x\left(x-1\right)$
• B. $\frac{x\left(x+1\right)}{2}$
• C. $x\left(x+1\right)$
• D. $x^2$

Answer: Option D

Explanation: