Three consecutive numbers add up to 426. What are the numbers?

2 answers:

5 0

X + x+1 + x+2 = 426 /-3

x + x + x = 423 /:3

x = 141

1) 141
2) 141+1
3) 141+2

Check: 141 + 142 + 143 = 426

Answer: 141, 142, 143

SpyIntel [72]4 years ago

5 0

If the numbers are all the same the answer is 142

142x3=426

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In a class of 28 students, 11 have a brother and 9 have a sister. There are 2 students

Westkost [7]

Answer:

$\displaystyle P(A\mid B)=\frac{2}{11}$

Step-by-step explanation:

<u>Conditional Probability</u>

Is a measure of the probability of the occurrence of an event, given that another event has already occurred. If event B has occurred, then the probability that event A occurs is given by:

$P(A\mid B)={\frac {P(A\cap B)}{P(B)}}$

Where $P(A\cap B)$ is the probability that both events occur and P(B) is the probability that B occurs.

Let's define events A and B for the question. There are 11 students that have a brother and 9 that have a sister. Two of those students have a brother and a sister.

We are given the fact that the selected student has a brother: this is the event that has already occurred, thus:

B = A student has a brother

A = A student has a sister

The probability that a student has a brother is:

$\displaystyle P(B)=\frac{11}{28}$