They're all divisible by the number 3.
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the anser is that you are stupid
39+27 = 66
15, 21, 27, 33, and 39 are.
2.6
To find the HCF of two numbers you first have to express them as a product of their prime factors. In this case: 15 = 3x5 39 = 3x13 The next step is to identify any common prime factors. In this case, both numbers have 3 as a prime factor. Therefore the HCF of 15 and 39 is 3.