when in problem not given , then what should i consider the object to be hollow or solid (eg.spehre)

Dear Student,

Your question is not clear and appears to be incomplete. Recheck your question and please be a little specific so that we can provide you with some meaningful help. Looking forward to hear from you again!
Although, if in the question it is not mention about the type of sphere then you can consider anyone but you have to mention the type of sphere which you consider.

Regards

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