Pretty much what the title says. Where in the Torah do we find something for which we need 10 Kohanim or 1 Yisrael?
closed as not a real question by Isaac Moses Jun 16 '11 at 22:11
It's difficult to tell what is being asked here. This question is ambiguous, vague, incomplete, overly broad, or rhetorical and cannot be reasonably answered in its current form. For help clarifying this question so that it can be reopened, see the FAQ.
In a minyan with 11 Jews, if they are all Kohanim, one goes up to duchan and 10 stay behind and answer Amen. If one of them is a Yisrael, all the Kohanim can duchan and the one Yisrael answers Amen (he is significant on his own since the main mitzva is to bless the Yisraelim. (SA OC 128:2,5 MB 101)