There is a sequence of numbers such that every entry except for the first entry is the arithmetic mean of its two neighboring entries. The 27th entry is 94 and the 94th entry is 27 . What's the first entry?

Please answer quickly

Guest Dec 20, 2018

edited by
Guest
Dec 20, 2018

edited by Guest Dec 20, 2018

edited by Guest Dec 20, 2018

#1**+1 **

94 =F + 26D,

27 =F + 93D, solve for F, D

F =120 - First term

D = -1 - Common difference

Guest Dec 20, 2018

#2**0 **

It didn't say that it was an arithmetic sequence though. I am confused as to what you mean. Couldn't it have been any other kind of sequence?

Guest Dec 21, 2018