Possible and often done, but very unlikely from India.
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Probably not. The ISO at NIU should be able to advise you further.
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You can't enter the U.S. on more than one visa. You'll need to pick one to use. If your school doesn't start until the fall, then entering on the B is appropriate. If you're starting school this summer, then entering on your F and attending the wedding is fine.
If the F-1 visa interview does not go well, CO might cancel B-2 too.
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