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Which pair of numbers is relatively prime?

A. 108 and 57

B. 21 and 183

C. 55 and 121

D. 60 and 151

Its not A because 108 and 57 are both divisible by 3

if you write the numbers in prime factor form you will see the correct optiuon

for example B:-

21 = 3 * 7

183 = 3 * 61 3 is common to both factors so its not B