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I live in India and I have noticed that in Indian English it is normal to use the noun "doubt" as one would use the noun "question" in Western English.
Examples:
"He had many doubts regarding the subject, so he asked his teacher to answer those doubts."
"Sir, I have a doubt, what is the square root of 64?"
Is this usage of the noun "doubt" unique to Indian English, or is it also acceptable in Western English?