A) The first day

B) The second day

C) The third day

D) The fourth day

E) The fifth day

\[ 21 - 2n, 21, 21 + 2n \]

In the above list, what is the average of the 3 numbers?

A) \( 21 - 2n \)

B) \( 21 \)

C) \( 21 + 2n \)

D) \( 63 \)

E) \( 2n \)

\[ 12 - 3n, 12 - 2n, 20, 20+n \]

In the above list, what is the average of the 4 numbers?

A) \( 12 - n \)

B) \( 12 + 2n \)

C) \( 16 - n \)

D) \( 16 + n \)

E) \(20\)

The sets of numbers \( X \) and \(Y \) satisfy the following property:

Every number that is in \(X\) is also in \(Y\).

Which of the following statements CANNOT be true?

A) 1 is in both \(X\) and \(Y\).

B) 2 is neither in \(X\) nor in \(Y\).

C) If 3 is in \(Y\), then 3 is not in \(X\).

D) 4 is in \(Y\) but not in \(X\).

E) 5 is in \(X\) but not \(Y\).

\[ 4, 5, 7, 11, 19 \]

Consider the list of numbers above starting with 4. Which of the following is a relationship for finding the subsequent number?

A) Add 1 to the preceding number.

B) Subtract 3 from the preceding number.

C) Halve the preceding number and add 3.

D) Double the preceding number and subtract 3.

E) Triple the preceding number and subtract 7.

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