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qwertylol12345
27.03.2020 •
Mathematics
If i were to randomly generate a 4-digit number, how likely is it that my number will include at least 1 seven?
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Ответ:
Probability that number will include at least 1 seven is
.
Step-by-step explanation:
Here we have , if i were to randomly generate a 4-digit number, We need to find how likely is it that my number will include at least 1 seven . Let's find out:
Out of 10 digits ( 0,1,2,3,4,5,6,7,8,9) , We are supposed to find probability to generate a 4 digit number with at least one times 7 . We can find this as Probability for at least one 7 = 1 - Probability for no 7
Total number of combinations =![10^4](/tpl/images/0567/2897/5e312.png)
Total number of combinations without 7 =![9^4](/tpl/images/0567/2897/c44c9.png)
Probability of Number without 7 =![\frac{9^4}{10^4}](/tpl/images/0567/2897/994cd.png)
⇒ Probability of Number without 7 =![\frac{6561}{10000}](/tpl/images/0567/2897/f147a.png)
⇒ Probability of Number without 7 =![0.6561](/tpl/images/0567/2897/c2f2a.png)
∴ Probability for at least one 7 = 1 - Probability for no 7
⇒![1-0.6561](/tpl/images/0567/2897/8d6d5.png)
⇒![0.3439](/tpl/images/0567/2897/dfbc9.png)
Therefore ,Probability that number will include at least 1 seven is
.
Ответ:
2
step-by-step explanation: