A blood bank needs 15 people to help with a blood drive. 20 people have volunteered. Find how many different groups of 15 can be
2 answers:
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Answer:
Step-by-step explanation:
a reciprocal is a number that when multiplied by a given number gives 1 as product.
16 * x = 1
x = 1/16
9/10 * x = 1
x = 10/9