Omar wants to buy a double scoop ice cream cone. His favorite flavors are vanilla, strawberry, raspberry and chocolate. A combination with both scoops of raspberry represents ___ out of ___ possible combinations.

Answer 1

4 C 2 = combination of 4, taken 2 at a time

C(4,2) = (4!/(4 - 2)!)/2! = 4!/(2!2!)
C(4,2) = (4x3x2x1)/(2x1x2x1)= 24/4 = 6

total of 6 combinations

1 out of 6 possible combinations

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