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S={1，2，3}
T={1，2，3，4}
Quantity A: The number of different four-digit integers formed by elements from Set S（all elements can be used by more than once） Quantity B: The number of different three-digit integers formed by elements from Set T（all elements can be used by more than once）
Quantity A: The number of different four-digit integers formed by elements from Set S（all elements can be used by more than once） Quantity B: The number of different three-digit integers formed by elements from Set T（all elements can be used by more than once）
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以上解析由 考满分老师提供。
