anonymous
  • anonymous
multiple choice answers.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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jamiebookeater
  • jamiebookeater
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anonymous
  • anonymous
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mathstudent55
  • mathstudent55
He can buy 3 items in 10 * 9 * 8 ways if order matters. Since in this case, buying shirts A, B, C is the same as buying shirts A, C, B, then you need to divide by 3 * 2 * 1 to get the total number of combinations of 3 shirts not allowing the same shirts in different orders. Then he can buy 2 items is 10 * 9 ways taking order into account, but then dividing by 2 * 1, you eliminate the order problem. The total number of ways is the sum of the two results above.
anonymous
  • anonymous
10 * 9 * 8= 720 3 * 2 * 1= 6 720/6= 120. Correct, or not finish?

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anonymous
  • anonymous
Then 10 * 9= 90 90/2= 45 120+45= 165.
anonymous
  • anonymous
165 is the final answer.
mathstudent55
  • mathstudent55
Correct.
anonymous
  • anonymous
Also, one last question.
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mathstudent55
  • mathstudent55
The first question is do you know the difference between permutations and combinations?
mathstudent55
  • mathstudent55
If order matters, then it's a permutation. If order does not matter, then it's a combination. When you arrange books on a shelf, does order matter or not?

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