The HCF is one
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51/49 = (49 + 2)/49 = 49/49 + 2/49 = 1 2/49
61 is a prime number. 49 is not a prime number as it is divisible by 7. 51 is not a prime number as it is divisible by 3.
No. 51 is not evenly divisible by four.
It is 51
1, 3, 5, 9, 15, 17, 45, 51, 85, 153, 255, 765.