问题描述：
What is a perfect square?
p-1,p+3,3p-1,in that order,from an arithmetic sequence.Which of the following is/are true about
1.p is even
2.p is odd
3.p is a perfect square.
p-1,p+3,3p-1,in that order,from an arithmetic sequence.Which of the following is/are true about
1.p is even
2.p is odd
3.p is a perfect square.
问题解答：
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