ANSWER:

This is an exception exactly like how you can fast the missed fasts of Ramadan or any other fard fasts on Friday or Saturday alone. 

When fasting the fast of nabi da’ud should one fast friday & saturday together or is it an exception.

Fasting | October 9, 2019 3:41 am
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There is a friend of mine who hasn’t repaid the last two year’s left out fasts and this year’s ramadhan has passed. What would you advise them to do.
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Recently I came to know that we ve make up for our missed Ramadan fasts.. Iam 29 yrs old and I got my periods when I was 10 yrs old.. I missed nearly 100fasts..