There is a prohibition of counting Jews (see here) for a number of reasons:
1) Out of love for His people, G‑d counted us at important junctures of our history. The completion of the Tabernacle was one of these occasions (Rashi on Numbers 1:1.). 2) To ensure that the Jews had sufficient numbers to merit the dwelling of the Divine presence upon them (Kli Yakar ibid). 3) To ascertain how many warriors the Jews would have in their upcoming battles to conquer Canaan.
Does the prohibition hold when there are non-Jews is a group?
Is counting two Jews the minimum number for this aveirah? If so then if you count "1, 2, 3, 4, 5, 6, 7, 8" for a 'Jew, Jew, non-Jew, Jew, Jew, non-Jew, Jew, Jew' have you done, a) no aveirah at all because its a mixed group, b) three separate aveirot for each pair of Jews you count, or c) one aveirah of counting Jews together, or d) none of the above!