What would be the 560th number?

What would be the 560th number?

Postby Guest » Thu Dec 31, 2020 11:00 am

The rule is to add 13 to the previous number...

This is the sequence; 8, 21, 34, 47, 60...

What would be the 560th number in this sequence and why?

Pls help!

Thanks :)
Guest
 

Re: What would be the 560th number?

Postby nathi123 » Sat Jan 02, 2021 12:49 pm

[tex]a_{1 }=8 ; a_{2 }=a_{1 }+13=21; a_{3}=a_{2 }+13=34... \Rightarrow[/tex] this is an arithmetic progression[tex]\Rightarrow a_{n }=a_{1 }+( n-1).d ; a_{1 }=8 ; d=13;n=560[/tex]
[tex]a_{560 } = 8 + (560 -1 ).13 = 8 + 559.13 = 8 + 7267 = 7275[/tex]

nathi123
 
Posts: 40
Joined: Sun Sep 17, 2017 1:56 pm
Reputation: 36


Return to Math Riddles



Who is online

Users browsing this forum: No registered users and 1 guest