• 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. ${(a+b)}^3$
• D. ${(a-b)}^3$

Answer: Option D

Explanation:

• A. 6
• B. 7
• C. 8
• D. 9

Answer: Option B

Explanation:

• A. 49:70:40
• B. 49:40:70
• C. 40:70:49
• D. 70:49:40

Answer: Option D

Explanation:

• A. $20$
• B. $40$
• C. $60$
• D. $80$

Answer: Option B

Explanation:

• A. $-1$
• B. $0$
• C. $1$
• D. $2$

Answer: Option C

Explanation:

• A. $6$
• B. $7$
• C. $8$
• D. $10$

Answer: Option C

Explanation:

• A. $10$
• B. $-10$
• C. $1$
• D. $-1$

Answer: Option D

Explanation:

• A. $1$
• B. $2$
• C. $3$
• D. $4$

Answer: Option C

Explanation:

• A. -8
• C. 1
• D. 5

Answer: Option A

Explanation:

• A. $\sqrt{২}$
• B. $৪$
• C. $১$
• D. $২\sqrt{৩}$

Answer: Option B

Explanation:

• A. 60
• B. 64
• C. 63
• D. 69

Answer: Option C

Explanation:

• A. -4 ≤ x ≤ 4
• B. -2 ≤ x ≤ 0
• C. 2 ≤ r ≤ 2
• D. -2 ≤ x ≤ 2

Answer: Option B

Explanation:

• A. $4^x$
• B. $4^{x+1}$
• C. $4^{x+4}$
• D. $4^{x+6}$

Answer: Option B

Explanation:

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

Answer: Option B

Explanation: