1 and 2. Although 1 is really a trivial factor - it is a factor of all integers.
14 and 2
First, note the factors of each number. The factors of 14 are 1, 2, 7 and 14. The factors of 16 are 1, 2, 4, 8 and 16. Common factors are any factors which are shared by the two numbers. Both numbers have 1 and 2 as factors. Thus the common factors of 14 and 16 are 1 and 2.
The common factors of 14 and 16 are 1 and 2.
14 over 16 is a fraction, not two separate numbers. Therefore, a single number, and especially a fraction, cannot have any common factors.
The factors of 16 are: 1, 2, 4, 8, and 16.The only prime factor of 16 is: 2.The factors of 42 are: 1, 2, 3, 6, 7, 14, 21, and 42.The prime factors of 42 are: 2, 3, and 7.
CF(12, 14, 16) = 1 and 2
The factors of 12 are: 1, 2, 3, 4, 6, 12 The factors of 14 are: 1, 2, 7, 14 The factors of 16 are: 1, 2, 4, 8, 16
The common factors are: 1, 2
The factors of 14 are: 1, 2, 7, 14 The factors of 16 are: 1, 2, 4, 8, 16 The factors of 20 are: 1, 2, 4, 5, 10, 20 The factors of 40 are: 1, 2, 4, 5, 8, 10, 20, 40
The factors of 14 are: 1, 2, 7, 14The factors of 16 are: 1, 2, 4, 8, 16The common factors are: 1, 2
The factors of 14 are: 1, 2, 7, 14The factors of 16 are: 1, 2, 4, 8, 16The common factors are: 1, 2
12, 14, and 20 have an even number of factors. 4, 9, and 16 also have an even number of factors, but since they're perfect squares, two of the factors are the same number in each case, so each appears to have an odd number of factors.