Question on GCF on Prep Swift

GRE Quant Problem Solving
1

Question: Numbers are said to be “co-prime” if they share no common factors other than

  1. Which three numbers below are all co-prime with each other?
    Select three answer choices.

75
100
143
147
154

The answer said 100 143 and 154, but can’t it also be 75, 143, and 154?

2

143 and 154 share a common factor

3

can 100,143,147 be the answer??? three of them doesn’t have common factor more than 1 with each other.

4

The answer should actually be 100, 143 and 147.

143 and 154 share 11 as common factor and therefore are not coprime.