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Volgvan
3 years ago
5

How many 4 digit palindromes contain both the digits 1 and 2

Mathematics
1 answer:
Norma-Jean [14]3 years ago
8 0

What a clever sneaky little problem !

There can only be two of them:    1221  and  2112 .

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A boy's age in ten year time will be four times his age five years ago. Find his present age. ​
Katyanochek1 [597]

Answer:

He is ten.

Step-by-step explanation:

10 yrs old. Go ahead 10 yrs to make 20. Which is four times as much as five years old. (Which is 5 years before 10)

Hope this helps! :)

8 0
3 years ago
Is there anyone that can help me with a test?
Reptile [31]
Sure but where is the test?
8 0
2 years ago
If a procedure meets all of the conditions of a binomial distribution except the number of trials is not​ fixed, then the geomet
morpeh [17]

Answer:

The probability is 0.0428

Step-by-step explanation:

First, let's remember that the binomial distribution is given by the formula:

P(X=k) =\left[\begin{array}{ccc}n\\k\end{array}\right] p^{k}(1-p)^{n-k} where k is the number of successes in n trials and p is the probability of success.

However, the problem tells us that when there isn't a number of trials fixed, we can use the geometric distribution and the formula for getting the first success on the xth trial becomes:

P(X=x) = p(1-p)^{x-1}\\

The problem asks us to find the probability of the first success on the 4th trial (given that the first subject to be a universal blood donor will be the fourth person selected)

Using this formula with the parameters given, we have:

p = 0.05

x = 4

Substituting these parameters in the formula and solving it, we get:

P(X=4) = 0.05(1-0.05)^{4-1}\\P(X=4) = 0.05 (0.95)^{3}\\P(X=4) = 0.05(.8573)\\P(X=4) = 0.0428

Therefore, the probability that the first subject to be a universal blood donor is the fourth person selected is 0.0428 or 4.28%

7 0
3 years ago
Is 289 prime? I need this asap (provide factor tree)
antiseptic1488 [7]

Answer: 289 is a semi-prime number that is created by doing 17 times 17. 17 is a prime number though. hope this helps.

Step-by-step explanation:

                           289

                         17    17                

6 0
3 years ago
Whats is 3x3 to the power of 6
RUDIKE [14]

Answer:

2187

So you do 3 x (3 6)

5 0
2 years ago
Read 2 more answers
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