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I would like to know which setence is correct.

Grade A is preferable to grade B.

or

Grade A is preferable than grade B.

Thanks,

Philip
Comments  
Grade A is preferable than grade B.

Thanks,
erwin
"I would like to know which setence is correct."

Only the preferable to is acceptable in the context.

in comparisons, we say "as preferable as" or "more/less preferable than".
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Yes, Inchoateknowledge is correct. Preferable to, in the context you have given.
preferable is an adjective

Grade A is in the relation of being preferable to grade B.

obviously works

Grade A is in the relation of being preferable than grade B.

does not work.

Here is why:

Grade A is more wanted than grade B.

Grade A is more wanted than grade B is wanted.

works.

Grade A is preferable than grade B is [what?]. impossible to resolve

preferable has no gradation that is needed to use than

Grade A is less preferable than grade B [is preferable]. is, though not very soundy, fine
The sentence 'Grade A is preferable to grade B.' is correct.

The preposition after 'prefer' or 'preferable' should be 'to'.

For example, I prefer grade A to grade B.
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"preferable to" is preferable over "preferable than", but "preferable over" is most preferable of them all ;-)

Dominik

Awesome!!!!