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about co-primes

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by sanju09 » Wed Apr 22, 2009 2:49 am
If there is no common factor (other than 1) among the numbers, the numbers are called “co-primes”. Which of the following is NOT true about co-primes?
A. The highest common factor of co-primes is 1.
B. 16, 27, 25 form a set of co-primes.
C. Two or more numbers that have 3 or more factors, can form a set of co-primes.
D. Any two consecutive numbers will always be co-prime.
E. A set of primes (numbers with exactly 2 factors) is not a set of co-primes.



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by Sher1 » Wed Apr 22, 2009 2:55 am
E. Group of prime numbers will always be co primes as they will have no other factor but 1
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