The number of elements of order 2 in even order groups must be odd
举一反三
- Here must be an even number ( ) in any graph. A: Node with even degrees B: The node of the entry degree is odd. C: Nodes with odd degrees D: The node of the outing is an odd number.
- The even number is yang while the odd number is yin.
- If a group has at least two elements of order 2, then this group is not cyclic.
- The number of subgroups of order 25 of an Abelian group of order 50 is ( ). A: 0 B: 1 C: 2 D: 3
- What is the order number?