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Sep 19, 2011 at 20:18 comment added Peter Shor Yes, I am. The phrase "or whether" is used nearly as often as "or if". See this Google Ngram. Since nearly all of the seach results I checked for "or whether" were used in sentences similar to mine above, while most of the instances of "if ... or if" could not be replaced by "whether", that means that "whether ... or whether" is actually more common for this usage.
Sep 19, 2011 at 19:38 comment added Dave Are you sure that "whether ... or whether" is proper form?
Sep 19, 2011 at 19:07 history answered Peter Shor CC BY-SA 3.0