Question

i didnt understand why should it be a factor

Answer 1

Hi pupil here's your answer ::

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@It's just giving a probability that 18 must be factor of 380
@It is there for one more reason that is:
according to euclid's formula ; which is used to find out The H.C.F of a number using division method
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hope that it helps. . . . . . .

Answer 2

H.C.F stands for highest commn factor

means the result of hcf is the greatest number which divide all the given number which is used for finding hcf

thus we can say that it is the number must have a factor 18
means multiple of 18..

hope u understand
if not then comment..