However, once we have answered, we cannot add this, because it would exceed the number of problems on the test. Therefore, since we must have (otherwise we could subtract four wrong and add one right to make the score with a different combination), we have,, which gives a score of .
Samakatuwid, dahil kailangan namin (kung hindi namin maaaring alisin apat na mali at magdagdag ng isa sa karapatan upang gumawa ng iskor na may iba't-ibang kombinasyon), kami ay may,, Na nagbibigay ng iskor ng .