"The" co-Prime number is wrong; for any number, there are infinitely other numbers that are co-prime with it, not just one.
Get the prime factors for 72. Then, any number made up of factors that DON'T include those prime factors is co-prime with 72. For example, 49 (which is 7 x 7), or 35 (5 x 7) are coprime with 72, since neither 5 nor 7 are among the prime factors of 72.
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coprime numbers with 18 are : 17 and 19.
When the two numbers are coprime. Coprime numbers need not be prime numbers - they must not have any factor in common (other than 1). So, for eaxmple, neither 8 nor 9 are prime numbers but they are coprime and so, LCM(8 , 9) = 72
No because 31 is a prime number but 62 is a composite number
1. The two numbers are coprime.
72/9 = 8, a whole number.