Pratap correctly remember that his mother's birthday is before twenty third April but after Nineteenth April, where his sister correctly remembers that their mother's birthday is not on or after twenty second April. On which day in April is definitely their mother's birthday?

• Mother's b'day is before 23rd April and after 19th April .So days may be 20, 21,22.
  But Pratap's Sister remember that her mother's b'day is before 22.
  Thus b'day is on 20th april or 21st April .
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