NGM|1|1| Numbers 1 - 10

Which one of the following is not a prime number?

• 131

• 137

• 139

• 143

The remainder obtained when a prime number greater than 6 is divided by 6 is

• 1 or 5

• 3 or 5

• 1 or 3

• 4 or 5

How many factors does the number 360 have?

• 12

• 16

• 24

• 20

You have 100 doors in a row that are all initially closed. You make 100 passes by the doors starting with the first door every time. The first time through, you visit every door and toggle the door (if the door is closed, you open it; if it's open, you close it). The second time, you only visit every 2nd door (door #2, #4, #6), and so on, until you only visit the 100th door. After the last pass, how many doors are closed?

• 0

• 90

• 99

• 100

In a temple, there are some magical bells which toll 30 times in a day simultaneously. But every bell tolls at a different interval of time, but not in a fraction of minutes. What is the maximum number of bells in the temple?

• 10

• 12

• 20

• 30

Which of the following pairs of numbers is coprime?

• (6, 28)

• (21, 16)

• (12, 18)

• (15, 27)

If 9P3627Q is divisible by 88, then what is the value of P?

• 2

• 4

• 3

• 8

If the number 24831*75 is exactly divisible by 9 , then the minimum value of * is:

• 0

• 6

• 2

• 3

836*413 = 34N268. What is the value of N ?

• 1

• 2

• 5

• 7

What is the remainder when the number 1,234,567,890 is divided by 9?

• 0

• 1

• 7

• 8