Asked by Anonymous
7 topping how many different 2 topping can there be
Answers
Answered by
Damon
combination of 7 toppings taken 2 at a time without regard for which is first
n!/[r!(n-r)!]
7!/[ 2! (5!) ]
7 * 6 /2
7 * 3
n!/[r!(n-r)!]
7!/[ 2! (5!) ]
7 * 6 /2
7 * 3
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