No it is not.
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Yes. Suppose x divides y then there exist an integer p such that y = px. Suppose y divides z then there exist an integer q such that z = qy. Therefore z = q*px = qp*x Since p and q are integers then pq is an integer and therefore x divides z. That is to say: if x divides y and y divides z, then x divides z.
The smallest positive integer that divides into any number is 1.
The greatest common factor, or GCF, (also known as highest common factor) is the largest positive integer that will divide evenly with no remainder into all the members of a given set of numbers.
The prime factors of 14 are 2 and 7. 1, 2, 7 and 14 are all integers that can divide into 14 without a remainder.
The answer for C would be 32, so the digits equal 5 when added together.