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vagabundo [1.1K]
3 years ago
8

Help! What is |-3|+|3| ?

Mathematics
1 answer:
kvv77 [185]3 years ago
6 0
|a|=  \left\{\begin{array}{ccc}a&for\ a\geq0\\-a&for\ a \ \textless \  0\end{array}\right\\\\Examples:\\|2|=2\ because\ 2\geq0\\|0|=0\ because\ 0\geq0\\|-5|=-(-5)=5\ because\ -5 \ \textless \  0\\|-100|=-100\ because\ -100 \ \textless \  0

|-3| + |3| = 3 + 3 = 6
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1. Assuming the failure is in the calculator, not the operator, and the failures are independent, the probability of finishing with at least one working calculator is the complement of the probability that both will fail. That is ...

... P(≥1 working) = 1 - P(both fail) = 1 - P(fail)² = 1 - (1 - 0.92)² = 0.9936

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This odds ratio is 155.25/11.5 = 13.5 times as good as the odds with only one calculator.

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