<p>There is this one sequence that I can not figure out the pattern for. It can be geometric, arithmatic or a mix.
1, 3, 15, 105, 945, 10395, 135135, 2027025, 34459425</p>
<p>And the survey question, my hw to survey ppl, assuming 50/50 chance for boy or girl. What family is more likely to have 2 girls, each family has 2 kids
A) Atleast one girl A and b descibe familys + are choices
B) elder child is a girl
C) not enough info
D) equally likely</p>
<p>The sequence, starting from 1:</p>
<p>1 * 3 = 3, 3 * 5 = 15, 15*7= 105, 105 * 9 = 945,</p>
<p>you are just multiplying by odd numbers....3, 5, 7, 9, 11, etc.</p>
<p>I don't get the survey...</p>
<p>The sequence is x3, x5, x7, x9, x11, x13, etc. Not sure what type that would be. </p>
<p>Don't really understand your survey. ThankS!</p>
<p>Equally likely for your "survey."</p>
<p>i think the survey may just be another homework question that he cant solve</p>
<p>Nope, and the sequence I was thinking that this one had to be in terms of n, so I was looking for a type of sequence like that. Some of the time, its with the c+ar^n or some variation, and I guess this wasnt.
The survey to clarify
Each family has 2 kids
Which one is more likely to have 2 girls
family a has atleast 1 girl
family b, the elder child is a girl. It is not said what the other child is. That is up to you.</p>
<p>I know the correct answer, but I will post it here tomorrow, unless someone else posts that I dont know it.</p>
<p>Family (a) can have (sorted by age) BG, GB or GG; the chances of both being girls is 1/3.
Family (b) can have GB or GG; the changes of both being girls is 1/2.</p>
<p>8 people I surveyed in the physics/calc class said they were equally likely. One kid argued for an hour about it, and then eventually said, according to the parameters, its not equal.
My stats teacher use to make money off of doing this with cards/coins, because most people think theyre equal.</p>