Can two who bentched individually still join a different group of three for zimun?

If three people ate together but each bentched individually (forgetting to do zimun), can they still perform zimun afterward?

3 opinions

If two of the three bentched individually but the third did not, can the two perform zimun with the third?

3 opinions

If the third person (who already bentched individually) subsequently performed zimun with a different group, can the original two still do zimun with him?

3 opinions

If one of the three left to the marketplace before Birkat HaMazon, can the remaining two call to him and perform zimun without his physical presence at the table?

3 opinions

If three people ate together but none of them knows the full Birkat HaMazon — only one knows the first blessing, one the second, and one the third — are they obligated in zimun, and may they each recite only the blessing they know?

4 opinions

When three ate together and began to bentch individually (e.g., started 'Baruch Atah Hashem hazan et ha'olam'), at what point is the zimun obligation lost?

1 opinions

In a group of ten where three forgot and bentched individually, may the remaining seven still perform zimun with God's name?

1 opinions