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QUESTION
What are the prime factors of 57?
Prime factors of ##57## are ##3xx19##.
As the sum of the digits of ##57## is ##12##, a multiple of ##3##, hence, ##57## is divisible by ##3##.
Therefore, ##57=3xx19##
Now as ##19## is a prime number, there are no further factors and
Prime factors of ##57## are ##3xx19##.
