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ruslelena [56]
3 years ago
12

Which is equivalent to (-2 + 4i)(7 + 2i)?

Mathematics
1 answer:
MatroZZZ [7]3 years ago
4 0
<span> D) -22 + 24i ,,,,.............</span>
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Answer:

45

Step-by-step explanation:

The order in which the items are chosen is not important. So we use the combinations formula to solve this question.

Combinations formula:

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

C_{n,x} = \frac{n!}{x!(n-x)!}

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Combinations of 2 from a set of 10. So

C_{10,2} = \frac{10!}{2!(10-2)!} = 45

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