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

Answer: Option A

Explanation:

• A. ৬
• B. ৯
• C. ১২
• D. ১৫

Answer: Option B

Explanation:

• A. n-1/n+1
• B. 2n/n+1
• C. 1/n
• D. n/n+1

Answer: Option D

Explanation:

• A. 90 sq. m
• B. 64 sq. m
• C. 63 sq. m
• D. 70 sq. m

Answer: Option C

Explanation:

• A. গ্রাম
• B. ফুট
• C. লিটার
• D. এয়র

Answer: Option C

Explanation:

• A. 142 , 163
• B. 144, 169
• C. 145 , 168
• D. 140 , 160

Answer: Option D

Explanation:

• A. 1080
• B. 1240
• C. 1460
• D. 1620
• E. 1800

Answer: Option B

Explanation:

• A. -1
• B. 1
• C. $\frac{1}{2}$

Answer: Option B

Explanation:

• A. ৮
• B. ১০
• C. ১৪
• D. ১৫

Answer: Option D

Explanation:

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

Answer: Option C

Explanation:

• A. ৩৪
• B. ৫৫
• C. ৮৯
• D. ১৪৪

Answer: Option C

Explanation:

• A. নবম
• B. দশম
• C. একাদশ
• D. সপ্তম

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. ৪২টি
• B. ৪১টি
• C. ৪৩টি
• D. ৪০টি

Answer: Option B

Explanation:

• A. 98
• B. 106
• C. 102
• D. 112

Answer: Option C

Explanation: