• A. $a^2-b^2$
• B. $a-b$
• C. ${\left(a+b\right)}^2$
• D. $\left(a+b\right)$

Answer: Option D

Explanation:

• A. $n^2-1$
• B. $n^2$
• C. $n^2+1$
• D. $n^2+2$

Answer: Option B

Explanation:

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

Answer: Option A

Explanation:

• A. m ধনাত্মক হলে
• B. n ধনাত্মক হলে
• C. m ও n ধনাত্মক হলে
• D. m ধনাত্মক n ঋণাত্মক হলে

Answer: Option C

Explanation:

• A. $\frac{1}{a}$
• B. $a^2$
• C. $a$
• D. $\frac{1}{a^2}$

Answer: Option C

Explanation:

• A. ১১ সেকেন্ড
• B. ১০ সেকেন্ড
• C. ১২ সেকেন্ড
• D. ১৫ সেকেন্ড

Answer: Option B

Explanation:

• A. $360°$
• B. $270°$
• C. $180°$
• D. $0°$

Answer: Option A

Explanation:

• A. $\frac{5}{4}$
• B. $\frac{4}{9}$
• C. $\frac{3}{5}$
• D. $\frac{5}{3}$

Answer: Option D

Explanation:

• A. $4$
• B. $3$
• C. $2$
• D. $0$

Answer: Option A

Explanation:

• A. 10
• B. 9
• C. -9
• D. -2

Answer: Option C

Explanation:

• A. ৩
• B. ৪
• C. ৫
• D. ৬

Answer: Option C

Explanation:

• A. ২০টি
• B. ৩০টি
• C. ৪০টি
• D. ৫০টি

Answer: Option D

Explanation:

• A. ৫
• B. -৫
• C. $\frac{১}{৫}$
• D. $-\frac{১}{৫}$

Answer: Option C

Explanation:

• A. 10
• B. 9
• C. 16
• D. 12

Answer: Option D

Explanation:

• A. $\frac{\sqrt{2}+\sqrt{3}}{2}$
• B. $\frac{\sqrt{2}.\sqrt{3}}{2}$
• C. 1.5
• D. 1.8

Answer: Option C

Explanation: