Which one of the number does not belong

- Which one of the number does not belong in the following series
- Which one of these does not belong to solo play
- Which number does not belong 3 5 6 9 18
- Which number does not belong
- Which one of the following does not belong to himalayan rivers
- Which one of the following does not belong
- Which one of the following does not belong to alkaline earth metals
- Which one of the following does not belong to biotic community
- Which one of the following does not belong to group
- Which one of the following attributes does not belong to image tag
- Which one of the following drugs does not belong in an emergency drug tray
- Which one of the figures below does not belong
- Which one of the following organs does not belong to circulatory system
- Which one of the following activities does not belong to primary sector