The five numbers a, b, c, d, and e are different, and the products of their two-by-two multiplication are arranged in ascending order: 3, 6, 15, 18, 20, 50, 60, 100, 120, 300． Then, what is the square of the second number arranged in ascending order among these five numbers?
a、b、c、d、e这五个数各不相同，它们两两相乘后的积从小到大排列依次为：3，6，15，18，20，50，60，100，120，300．那么，这五个数中从小到大排列第2个数的平方是多少
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