1. A
   $(198)_{10}$
2. B
   $(199)_{10}$
3. C
   $(200)_{10}$
4. D
   $(201)_{10}$

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

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1. A
   $xyz = 1$
2. B
   $x + y + z = 1$
3. C
   $(1+x)^{-1}+(1+y)^{-1}+(1+z)^{-1}=1$
4. D
   $(1+x)^{-2}+(1+y)^{-2}+(1+z)^{-2}=1$

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1. A
   $-10$
2. B
   $-14$
3. C
   $-24$
4. D
   $-34$

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1. A
   $(2x-3)(2x-9)>0$
2. B
   $(2x-3)(2x-9)<0$
3. C
   $(2x-3)(2x-9)\geq 0$
4. D
   $(2x-3)(2x-9)\leq 0$

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1. A
   reflexive only
2. B
   symmetric only
3. C
   transitive only
4. D
   both symmetric and transitive

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

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1. A
   $\begin{pmatrix}ax+hy+gz \\ y \\ z\end{pmatrix}$
2. B
   $\begin{pmatrix}ax+hy+gz \\ hx+by+fz \\ z\end{pmatrix}$
3. C
   $\begin{pmatrix}ax+hy+gz \\ hx+by+fz \\ gx+fy+cz\end{pmatrix}$
4. D
   [ax+hy+gz hx+by+fz gx+fy+cz]

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1. A
   2
2. B
   4
3. C
   6
4. D
   8

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1. A
   10
2. B
   15
3. C
   20
4. D
   25

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1. A
   $0°$
2. B
   $28°$
3. C
   $38°$
4. D
   $52°$

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

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1. A
   0
2. B
   1
3. C
   $2\sin 2x$
4. D
   $4\cos 4x$

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1. A
   $[0, 1]$
2. B
   $[0, 3]$
3. C
   $[-1, 1]$
4. D
   $[1, 3]$

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1. A
   $\tan 10°$
2. B
   $\cot 10°$
3. C
   $\csc 10°$
4. D
   $\sec 10°$

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1. A
   $\frac{\sqrt{5}-1}{4}$
2. B
   $\frac{1-\sqrt{5}}{4}$
3. C
   $\frac{\sqrt{5}+1}{2}$
4. D
   $\frac{1-\sqrt{5}}{8}$

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1. A
   1 only
2. B
   2 only
3. C
   Both 1 and 2
4. D
   Neither 1 nor 2

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1. A
   1 only
2. B
   2 only
3. C
   Both 1 and 2
4. D
   Neither 1 nor 2

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