An integer is chosen at random and squared. Find the probability that the last digit of the square is 1 or 5.
An integer is chosen at random and squared. Find the probability that the last digit of the square is 1 or 5.
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The unit digit of square will be 1 or 5 only when the unit digit of taken number is 1, 5 or 9.
`therefore` Required probability = `(3)/(10)`
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