9. State which of the following sets are infinite:
i) \( \{x: x \in N \) and \( x \) is a prime number \( \} \);
ii) \( \{x: x \) is a quadrilateral on a plane \( \} \);
iii) \( \left\{x: x \in A\right. \) and \( \left.x^{2}-25<0\right\} \);
iv) \( \{x: x \in N \) and \( x \) is a multiple of 3\( \} \);
v) \( \{x: x \in R \) and \( 0<x<5\} \);
vi) \( \{x: x \) is a factor of 2100\( \} \)
vii) \( \{x: x \) is a house in Canada \( \} \).
10. State in which of the following cases, \( A=B \) :
i) \( \mathrm{A}=\{12,14,16\}, \quad \mathrm{B}=\{16,18,20\} \);
ii) \( A=\{2,4,6,8\}, \quad B=\{4,8,6,2\} \);
iii) \( \mathrm{A}=\emptyset \),
\[
B=\{ \}
\]
iv) \( A=\{x: x \in W \) and \( x<1\} \),
\( B=\emptyset \)
vi) \( A=\{x: x \) is a letter of the word TOP \( \} \),
\( \mathrm{B}=\{x: x \) is a letter of the word POT \( \} \).
vii) \( A=\left\{x: x \in Z\right. \) and \( \left.x^{2}<8\right\} \),
\( B=\left\{x: x \in R\right. \) and \( \left.x^{2}-4 x+3=0\right\} \).
11. Which of the following sets are equal?
i) The set consisting of the alphabets A, E, S and T.
ii) The set of letters in the word TEASE.
iii) \( \{x: x \) is a letter in the word SEAT \( \} \)
iv) \( \{x: x \) is a letter in the word EAST \( \} \)
\( v) \) The set of letters in the word ASSETS.
pazunos 29 of ??!?
jos ayuly
II - syas
