ANSWER: No problem in fasting Friday alone for arafat or ashura. It’s not permissible to fast a day after arafat because its the eid day and its prohibited to fast on eid days and the days of tashreeq (11, 12, 13 of dhul-hajja)

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ANSWER: No problem in this.  The prohibition is in keeping a voluntary fast on Friday alone or Saturday alone. 

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