The entire premise of a spartan even remotely standing a chance of winning rests upon the highly unlikely scenario of the two meeting one on one, in daylight( the reasons for this unlikeliness of said scenario are that ninja would have prepared their every move in whatever mission they were engaging in meticulously. Secondly, the age-old factor of numbers would be on their side[given, ninja would typically move in units].On a tertiary note, nearly all 'missions' of the ninja occurred at night, to give them the added benefit of camouflage!). The much more likely event would be that a ninja assassinates the Spartan as he sleeps(and ergo will be unarmed).

Finally, I would like to examine the weapons in said teams' arsenal... the ninja were expert engineers that specialised in repurposing generic tools for things like agriculture, into deadly weapons. One such notable mention is a bunch of poisonous iron filings, that could be thrown directly into the (unprotected) eyes of any Spartan.

Personally, I find the fact that the digits of this number sum to 36, combined with 36 being in it so mathematically drôle that it wins outright!