If all the factors of 240 are written in increasing order, the factor which occupies the 16th position is?
- 120
- 48
- 60
- 80
QUESTION 2
abc is the smallest three digit positive integer with six odd factors and twelve even factors (where a, b, and c are digits). What is the value of b?
QUESTION 3
How many factors of 840 are multiples of 5 but not of 8?
QUESTION 4
How many positive perfect square less than \({10^6}\) are multiples of 24?
QUESTION 5
A certain integer N has exactly eight factors, counting itself and 1. The numbers 35 and 77 are two of the factors. What is the sum of the digits of N?
- 9
- 10
- 16
- 18