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3 years ago

14

Write the expression 18 - 27-9 in the form of a +bi.

1 answer:

My name is Ann [436]3 years ago

3 0

V(18-1811) también eres el mejor en la vida y tú me ganas de comer

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A ski patrol unit has nine members available for duty, and two of them are to be sent to rescue an injured skier. In how many wa

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Answer:

36

Step-by-step explanation:

The number of two of the nine members of ski patrol unit can be chosen is equal to the combinations of 9 taken 2. This can be calculated using the formula:

$\frac{9!}{2!*(9-2)!}$

= $\frac{9!}{2!*7!}$ , where

9! =9×8×7×6×5×4×3×2×1 and

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= $\frac{9*8}{2}$ =36

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