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

Answer: Option D

Explanation:

• A. $\left(\frac{-7}{2},\frac{-7}{4}\right)$
• B. $\left(\frac{7}{2},\frac{-7}{4}\right)$
• C. $\left(\frac{7}{2},\frac{7}{4}\right)$
• D. $\left(-3,8\right)$

Answer: Option B

Explanation:

• A. ${\left(x-2\right)}^2+{\left(y-3\right)}^2=3^2$
• B. ${\left(x-2\right)}^2+{\left(y-3\right)}^2=2^2$
• C. ${\left(x-2\right)}^2+{\left(y+3\right)}^2=3^2$
• D. ${\left(x+2\right)}^2+{\left(y+3\right)}^2=2^2$

Answer: Option C

Explanation:

• A. $x$
• B. $xy$
• C. $\frac{xy}{2}$
• D. $y$

Answer: Option B

Explanation:

• A. $x^2+y^2+x+3y=0$
• B. $x^2+y^2-x+3y=0$
• C. $x^2+y^2+x-3y=0$
• D. $x^2+y^2-x-3y=0$

Answer: Option D

Explanation:

• A. 36
• B. 4
• C. 25
• D. ${25}^2$

Answer: Option A

Explanation:

• A. $\pm \sqrt{2}$
• B. $\pm 5\sqrt{2}$
• C. $\pm 2\sqrt{2}$
• D. $\pm 3\sqrt{2}$

Answer: Option C

Explanation:

• A. $x+\sqrt{3y}+10=0$
• B. $x-\sqrt{3y}+10=0$
• C. $\sqrt{3x}+y-10=0$
• D. $\sqrt{3x}+y+10=0$

Answer: Option B

Explanation:

• A. $-\frac{2}{5}$
• B. $-\frac{8}{5}$
• C. $\frac{5}{2}$
• D. $\frac{2}{5}$

Answer: Option C

Explanation:

• A. 8
• B. $\frac{\sqrt{10}}{3}$
• C. $\frac{10}{\sqrt{3}}$
• D. কোনটিই নয়

Answer: Option B

Explanation:

• A. -2
• B. $-\frac{1}{4}$
• C. -1
• D. $\frac{1}{4}$

Answer: Option D

Explanation:

• A. X
• B. Y
• C. X-Y
• D. $X^2-Y^2$

Answer: Option B

Explanation:

• A. x
• B. xy
• C. $\frac{xy}{2}$
• D. y

Answer: Option B

Explanation:

• A. x-y+2=0
• B. x+y-2=0
• C. x-2y+2=0
• D. x + 2y-2=0

Answer: Option B

Explanation:

• A. $3\frac{1}{8}$লাভ
• B. $12\frac{1}{2}$লাভ
• C. $1\frac{3}{8}$ক্ষতি
• D. $8\frac{1}{3}$ক্ষতি

Answer: Option D

Explanation: