More than one group answer choce

GRE Quant Problem Solving
1

For GCF prepswift question:

Numbers are said to be “co-prime” if they share no common factors other than 11. Which three numbers below are all co-prime with each other? Select three answer choice: ans options 75, 100, 143, 147, 154.

Prepswift solution show the three numbers and correct answer are: 100, 143 and 147

However the 3 no. group that also have only 1 common factors are 75, 143 and 154

2

The three numbers you mentioned do not have any common factor.

4

143 and 154 are not co-prime, so your answer doesn’t work.

You need to ensure that all pairs of numbers are coprime.