Pratap correctly remembers that his mother’s birthday is before twentythird April but after nineteenth April whereas his sister correctly remembers that their mother’s birthday is not on or after twentysecond April. On which day in April is definitely their mother’s birthday ?
According to Pratap, 19 < Date < 23 of April.
According to his sister, Date < 22 of April.
Hence, their mother's birthday could be on either 20th or 21st, of April.
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