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25-05-2022
Mathematics

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How many combinations without repetition are possible if n = 6 and r = 3? 56 20 27 18

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26-05-2022

Answer:18

Step-by-step explanation:

n+r=9

n×r=27

r²=9

n²=36

n+n=12

r+n=9

r+r=6

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