Sara has six necklaces, but her mother will only allow her to wear two at a time. How many different combinations of two necklac
es can Sara wear?
2 answers:
Answer:
15 different combinations
Step-by-step explanation:
Sara has six necklaces, but her mother will allow her to wear two at a time.
So we calculate different combinations of two necklaces by this formula:

Where n = 6 and r = 2
Now put the values





= 15 combinations
Sara can wear 15 different combinations of two necklaces.
6C2 = (6 x5)/(2 x 1) = 15 difference combinations
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hope it helps you!