Which set of numbers has a greatest common factor of 1 ?

a. 2,3,and 6
b. 2,200, and 400
c. 3,9,and 27
d. 22,33,and 99
e. 100,500, and 2,500

please answer and explain

3 answers

the factors of a) are
2,1
3,1
6,3, or 6,1 the greatest common factor is 1.

the factors of d are
11,2 ; 22,1
33,1, ; 11,3
99,1; 33,3; 11,9

the greatest COMMON factor is 11
The answer is d, right ?
wrong, the answer is a
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