If you attempt to send an invitation to an existing member (or someone who has already been invited) the system doesn't send a duplicate invitation. After you send invitations, an information bar shows the number of invitations sent. If any of the invitations were duplicated, the number indicated in the bar will be lower than the number you attempted to invite.
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Navigate to your Groups homepage.
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Select the applicable group from the list under Your groups.
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Click Manage group on the left pane.
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Click Invited on the left pane. You can view the details of the members to whom you’ve sent an invitation.
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Tap your profile picture, and then tap Groups on the left pane.
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In the Groups screen, select the applicable group under Your groups.
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Tap Manage Group in the upper-left corner, and then tap Manage membership from the dropdown.
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In the Manage membership/Manage group screen, tap the Invited tab. You can view the details of the members to whom you’ve sent an invitation.
You can search this list using the Search invited bar.