DSQ: Understanding sets Practice Test

Define two sets as follows:

$A = \left \{2, 4, 6, 8, 10, a, b \right \}$

$B = \left \{1, 3, 5, 7, 9, c, d \right \}$

where and are distinct positive odd integers and and are distinct positive even integers.

How many elements are contained in the set ?

1. $a, b \in \left \{ 1, 3, 5 ,7, 9\right \}$

2. $c,d \in \left \{ 2, 4, 6, 8, 10\right \}$

$A = \left \{ 2, 4, 6, 8, 10, 12, ...\right \}$

$B = \left \{ 3, 6, 9, 12, 15, 18...\right \}$

True or false:

Statement 1: is a perfect square.

Statement 2: is a multiple of 99.