• 100% Satisfaction Guarantee

Alex, Tutor
Category: Homework
Satisfied Customers: 415
Experience:  Tutoring college students since 1996. MS in CompSci 1996, MS in Math 2001.
606568
Alex is online now

1 1 2 4 3 10 4 20 5 35 6 56 7 84 8 120 9 165

Customer Question

1=1
2=4
3=10
4=20
5=35
6=56
7=84
8=120
9=165
10=220
what is an equation that will work for all of them
Submitted: 10 years ago.
Category: Homework
Expert:  Lauren N replied 10 years ago.
Hi there!
Lets say our first column is N, and our second column is Y, so

Yn= N^2 + Y(n-2)
(this means that the y that corresponds to the n is equal to N squared plus the y that was 2 places ago; for example, if we want to look at N=5, then it will be Y5= 5^2 plus Y (5-2) = 5^2 + Y3=5^2 plus the number that is in the Y3 position which is 10; so its 5^2 plus 10)

For n=2, it will be 2^2 plus the number that was 2 places ago, there was none, so its 0, which is 4 plus 0, which equals 4. 3^2 plus 1 (it was 2 places ago) which is 10, and so on! for n=4, its 4^2 plus 4(which was 2 places ago) which is 16 plus 4 which is 20, and this works for all of them so this works out! You just go through, square the N, look 2 places back in the y column, add that to N squared and you get your new Y. (10^2 plus 2 places ago in the y position (120) is 100 plus 120 which is 220. I hope this makes sense!

Hope this helped out! thanks for posting! if i helped, please accept! :)
Expert:  Alex replied 10 years ago.

Hello and welcome to JA!

The answer is n3/6 + n2/2 + n/3. Here's my solution:

---

Let me know if you need more help with this question.

Expert:  Alex replied 10 years ago.

You need to spend \$3 to view this post. Add Funds to your account and buy credits.

Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.

What Customers are Saying:

• Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
< Previous | Next >
• Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
• This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
• Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
• I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
• Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
• Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland
• He answered my question promptly and gave me accurate, detailed information. If all of your experts are half as good, you have a great thing going here. Diane Dallas, TX

• LogicPro

Satisfied Customers:

4925
Expert in Java C++ C C# VB Javascript Design SQL HTML
< Last | Next >

LogicPro

Satisfied Customers:

4925
Expert in Java C++ C C# VB Javascript Design SQL HTML

Manal Elkhoshkhany

Satisfied Customers:

4538
More than 5000 online tutoring sessions.

Linda_us

Satisfied Customers:

3138
Post Graduate Diploma in Management (MBA)

Chris M.

Satisfied Customers:

2602
Master's Degree, strong math and writing skills, experience in one-on-one tutoring (college English)

F. Naz

Satisfied Customers:

2126
Experience with chartered accountancy

Bizhelp

Satisfied Customers:

1887
Bachelors Degree and CPA with Accounting work experience