perplexus.info :: Sequences : Undefined Term

Undefined Term (Posted on 2008-03-14)

There is a sequence defined by using common mathematical operations.
The first two terms in the sequence are 10 and 12 and the sixth term is 60. The seventh term, however, is undefined.
What are the third, fourth and fifth terms?

Submitted by Brian Smith

Rating: 2.0000 (3 votes)

Solution: (Hide)

15, 20, 30

The sequence is defined as 60/(7-n) for n=1, 2, 3, ...
The sequence is then 10, 12, 15, 20, 30, 60, undef, -60, ...

Comments: ( You must be logged in to post comments.)

Subject	Author	Date
Puzzle Solution	K Sengupta	2023-11-03 11:08:51
Answer	K Sengupta	2008-12-21 02:39:43
No Subject	nitish	2008-08-21 11:14:54
Two sequences	brianjn	2008-03-14 21:42:33
A little naughty (??)	brianjn	2008-03-14 21:15:37
Solution	Dej Mar	2008-03-14 12:30:05

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