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Answer:
Step-by-step explanation:
6 different toppings
lets say they are
a b c d e f
you can have
a.b,a.c,a.d,a.e,a.f,b.c,b.d,b.e,b.f,c.d,c.e,c.f,d.e,d.f,e.f ad them up which is 15