are 3 daughters of a good mathematician "Geroge".
When I asked George the age of their daughters.
He replied "The current age of her daughters is prime.
Also, the difference between their ages is also prime."
How old are the daughters ?
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Their ages can be : 2,5, and 7 (all prime)7-2=5 (prime)
7-5=2 (prime)
5-2=3 (prime)