GRE Arithmetic and Number Properties 2

Question 1

What is the units digit of 7^23?

Accepted Answer

3

Answer

1

Answer

7

Answer

9

Question 2

If n is an integer, which expression is always even?

Accepted Answer

n^2 + n

Answer

n^2 + 1

Answer

2n + 1

Answer

n^2 - n + 1

Question 3

What is the greatest common divisor (GCD) of 84 and 120?

Accepted Answer

12

Answer

6

Answer

24

Answer

42

Question 4

How many distinct prime factors does 360 have?

Accepted Answer

3

Answer

2

Answer

4

Answer

5

Question 5

If the remainder when x is divided by 5 is 3, what is the remainder when 2x is divided by 5?

Accepted Answer

1

Answer

2

Answer

3

Answer

4

Question 6

Which of the following is the least common multiple (LCM) of 6, 8, and 9?

Accepted Answer

72

Answer

36

Answer

48

Answer

144

Question 7

If a positive integer has exactly 3 divisors, it must be which of the following?

Accepted Answer

The square of a prime

Answer

A prime number

Answer

A perfect cube

Answer

An even number