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1. A
   $A + B = C$
2. B
   $A + B = 2C$
3. C
   $A + B = 3C$
4. D
   $A + B = 4C$

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1. A
   $\frac{3}{10}$
2. B
   $\frac{2}{15}$
3. C
   $\frac{1}{15}$
4. D
   $\frac{3}{20}$

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1. A
   $\frac{19}{7}$ units
2. B
   $\frac{17}{7}$ units
3. C
   $\frac{11}{7}$ units
4. D
   $\frac{15}{7}$ units

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1. A
   $\sqrt[5]{\left(\frac{y}{x}\right)^3}$
2. B
   $-\sqrt[5]{\left(\frac{x}{y}\right)^3}$
3. C
   $\sqrt[5]{\left(\frac{x}{y}\right)^3}$
4. D
   $-\sqrt[5]{\left(\frac{y}{x}\right)^3}$

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1. A
   5
2. B
   2
3. C
   4
4. D
   6

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1. A
   $\frac{\pi}{12}$
2. B
   $\frac{\pi}{4}$
3. C
   $\frac{\pi}{3}$
4. D
   $\frac{\pi}{6}$

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1. A
   $a + c = b$
2. B
   $a + b = c$
3. C
   $b + c = a$
4. D
   $a + c = 2b$

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1. A
   $\frac{\pi}{2}$
2. B
   $\frac{\pi}{3}$
3. C
   $\frac{\pi}{4}$
4. D
   $\frac{\pi}{6}$

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1. A
   0
2. B
   2
3. C
   4
4. D
   6

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1. A
   Region A
2. B
   Region B
3. C
   Region C
4. D
   Region D

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1. A
   $(-6, 2, 0)$
2. B
   $(6, -2, 0)$
3. C
   $(-2, 0, 1)$
4. D
   $(2, 0, 1)$

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1. A
   100
2. B
   0
3. C
   200
4. D
   -100

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1. A
   $\frac{1}{5}$
2. B
   1
3. C
   0
4. D
   $-\frac{1}{5}$

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1. A
   15 units
2. B
   $\sqrt{15} - 2$ units
3. C
   $\sqrt{15} + 2$ units
4. D
   $\sqrt{15}$ units

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1. A
   3926
2. B
   3296
3. C
   3692
4. D
   3269

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1. A
   $\frac{8}{3}$
2. B
   $\frac{2}{3}$
3. C
   $\frac{10}{3}$
4. D
   $\frac{1}{3}$

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1. A
   I and II
2. B
   II and IV
3. C
   III and V
4. D
   I and III

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1. A
   $\tan^{-1}(x+y) = x + c$, where c is the constant of integration
2. B
   $x + y = \tan x + c$, where c is the constant of integration
3. C
   $x + y = \cot^{-1}x + c$, where c is the constant of integration
4. D
   $x + y = \sin^{-1}(x+y) + c$, where c is the constant of integration

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1. A
   $2x + y - 3 = 0$
2. B
   $x - 2y + 3 = 0$
3. C
   $x - 3y - 2 = 0$
4. D
   $2x - y + 6 = 0$

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1. A
   $x^2 + y^2 = k^2$
2. B
   $(1+k)x^2 + y^2 = k^2$
3. C
   $x^2 + (1+k^2)y^2 = k^2$
4. D
   $x^2 + 2y^2 = 2k^2$

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1. A
   $\frac{2}{3}$
2. B
   6
3. C
   2
4. D
   $\frac{1}{3}$

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1. A
   0
2. B
   1
3. C
   -1
4. D
   $\frac{1}{2}$

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1. A
   1
2. B
   2
3. C
   0
4. D
   -1

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1. A
   (2, -2, 1)
2. B
   (2, -3, 0)
3. C
   (1, -2, 3)
4. D
   (4, 1, 6)

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1. A
   $\mathbb{R}$
2. B
   $x \in \mathbb{R} - \{1\}$
3. C
   $\{1, 2, 3, 4\}$
4. D
   $\{1, 2, 3, 4, 5, 6\}$

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