• A. $\left(1+a-b\right)\left(1-a+b\right)$
• B. $\left(1+a+b\right)\left(1-a+b\right)$
• C. $\left(1+a+b\right)\left(1-a-b\right)$
• D. $\left(1-a+b\right)\left(1-a-b\right)$

Answer: Option A

Explanation:

• A. $x+y+1$
• B. $x-y$
• C. $x+y-1$
• D. $x-y-1$

Answer: Option C

Explanation:

• A. $4$
• B. $9$
• C. $16$
• D. $25$

Answer: Option D

Explanation:

• A. 4
• B. 3
• C. 2
• D. 1

Answer: Option B

Explanation:

• A. ১৮
• B. ১৭
• C. ১৫
• D. ১৬

Answer: Option A

Explanation:

• A. $xy$
• B. $x+y$
• C. $xy\left(x+y\right)$
• D. $x^{2}y\left(x+y\right)$

Answer: Option D

Explanation:

• A. ১০ মিটার
• B. ১২ মিটার
• C. ১৬ মিটার
• D. ৩২ মিটার

Answer: Option A

Explanation:

• A. 334
• B. 354
• C. 364
• D. 512

Answer: Option C

Explanation:

• A. 2
• B. 3
• C. 4
• D. 5

Answer: Option B

Explanation:

• A. $4xy$
• B. $2xy$
• C. $6xy$
• D. $8xy$

Answer: Option B

Explanation:

• A. $x^7-1$
• B. $x^7-1$
• C. $x^6-1$
• D. $x^5-1$

Answer: Option C

Explanation:

• A. $x=1,y=-1$
• B. $x=1,y=1$
• C. $x=-1,y=-1$
• D. $x=-1,y=1$

Answer: Option D

Explanation:

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

Answer: Option A

Explanation:

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

Answer: Option A

Explanation:

• A. $\frac{2}{5}$
• B. $\frac{5}{2}$
• C. $\frac{7}{4}$
• D. $\frac{11}{2}$

Answer: Option B

Explanation: