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statuscvo [17]
3 years ago
13

David told Jen, "Write three two-digit numbers. I'll add three more and give you the sum right away." Jen wrote 53, 42, and 31.

Then David wrote 46, 57, and 68 and said the sum was 297. Was he right? What pattern did he use?
Mathematics
1 answer:
alina1380 [7]3 years ago
8 0
He is correct. The pattern is -11,-11+15,+11 and +11
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The order in which the people are chosen is not important, hence, the <em>combination formula</em> is used to solve this question.

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C_{n,x} is the number of different combinations of x objects from a set of n elements, given by:

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In this problem, 8 people are chosen from a set of 12 + 15 = 27, hence:

C_{27,8} = \frac{27!}{8!19!} = 2220075

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To learn more about the combination formula, you can take a look at brainly.com/question/25821700

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