imp. question

Question

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@Hradesh Why not reflexive? a divides a is always true.

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@air1  i think that here (a divide b) or (b divide a)  but its not say a divide a ?? if i am wrong plz check?? and point it

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@Hradesh The question means that for any two elements $a$ and $b$ from set A, $a R b$ (element a is related to b) if $a$ divides $b$ or $b$ divides $a$. Now consider any element of set A, call it $p$. $p$ divides $p$, so $p R p$ so relation R is reflexive.